Imaging optical lens system, image capturing unit and electronic device

ABSTRACT

An imaging optical lens system includes, in order from an object side to an image side, a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element and a sixth lens element. The first lens element has negative refractive power. The second lens element has an object-side surface being concave in a paraxial region thereof and an image-side surface being convex in a paraxial region thereof. The third lens element has positive refractive power. The fourth lens element has positive refractive power. The fifth lens element has negative refractive power. The sixth lens element has positive refractive power. The imaging optical lens system has a total of six lens elements.

RELATED APPLICATIONS

This application is a divisional patent application of U.S. applicationSer. No. 15/208,546, filed on Jul. 12, 2016, which claims priority toTaiwan Application 105112655, filed on Apr. 22, 2016, which isincorporated by reference herein in its entirety.

BACKGROUND Technical Field

The present disclosure relates to an imaging optical lens system, animage capturing unit and an electronic device, more particularly to animaging optical lens system and an image capturing unit applicable to anelectronic device.

Description of Related Art

In recent years, with the popularity of electronic devices having camerafunctionalities, the demand of miniaturized optical systems has beenincreasing. As the advanced semiconductor manufacturing technologieshave reduced the pixel size of sensors, and compact optical systems havegradually evolved toward the field of higher megapixels, there is anincreasing demand for compact optical systems featuring better imagequality.

The wide-angle optical systems have been extensively applied todifferent kinds of electronic devices, such as smartphones, wearabledevices, tablet personal computers, dashboard cameras, securitysurveillance cameras, drones and so on. However, the conventionalwide-angle optical system is unable to satisfy the requirements of highimage quality and a compact size simultaneously, and as a result beingunsuitable for the use in miniaturized electronic devices. Thus, thereis a need to develop an optical system featuring wide field of view anda compact size while forming high quality images.

SUMMARY

According to one aspect of the present disclosure, an imaging opticallens system includes, in order from an object side to an image side, afirst lens element, a second lens element, a third lens element, afourth lens element, a fifth lens element and a sixth lens element. Thefirst lens element has negative refractive power. The second lenselement has an object-side surface being concave in a paraxial regionthereof and an image-side surface being convex in a paraxial regionthereof. The third lens element has positive refractive power. Thefourth lens element has positive refractive power. The fifth lenselement has negative refractive power. The sixth lens element haspositive refractive power. The imaging optical lens system has a totalof six lens elements. When a focal length of the imaging optical lenssystem is f, a focal length of the second lens element is f2, a focallength of the third lens element is f3, a central thickness of thesecond lens element is CT2, a central thickness of the third lenselement is CT3, an axial distance between the first lens element and thesecond lens element is T12, the following conditions are satisfied:−1.0<f3/f2<1.50;1.20<CT2/CT3<7.50; and0<f/T12<1.35.

According to another aspect of the present disclosure, an imagingoptical lens system includes, in order from an object side to an imageside, a first lens element, a second lens element, a third lens element,a fourth lens element, a fifth lens element and a sixth lens element.The first lens element has negative refractive power. The second lenselement has an object-side surface being concave in a paraxial regionthereof and an image-side surface being convex in a paraxial regionthereof. The third lens element has positive refractive power. Thefourth lens element has positive refractive power. The fifth lenselement has negative refractive power. The sixth lens element haspositive refractive power. The imaging optical lens system has a totalof six lens elements. When a focal length of the imaging optical lenssystem is f, a focal length of the second lens element is f2, a focallength of the third lens element is f3, a central thickness of thesecond lens element is CT2, a central thickness of the third lenselement is CT3, a central thickness of the fifth lens element is CT5, acentral thickness of the sixth lens element is CT6, a curvature radiusof an object-side surface of the fifth lens element is R9, a curvatureradius of an image-side surface of the fifth lens element is R10, anaxial distance between the first lens element and the second lenselement is T12, the following conditions are satisfied:−1.0<f3/f2<1.0;0.80<CT2/CT3<7.50;0<f/T12<1.50;0.20<CT6/CT5<7.0; and−8.0<(R9+R10)/(R9−R10)<0.

According to still another aspect of the present disclosure, an imagecapturing unit includes the aforementioned imaging optical lens systemand an image sensor, wherein the image sensor is disposed on an imagesurface of the imaging optical lens system.

According to yet still another aspect of the present disclosure, anelectronic device includes the aforementioned image capturing unit.

According to yet still another aspect of the present disclosure, animaging optical lens system includes, in order from an object side to animage side, a first lens element, a second lens element, a third lenselement, a fourth lens element, a fifth lens element and a sixth lenselement. The first lens element has negative refractive power. Thesecond lens element has an object-side surface being concave in aparaxial region thereof and an image-side surface being convex in aparaxial region thereof. The third lens element has positive refractivepower. The fourth lens element with positive refractive power has anobject-side surface being concave in a paraxial region thereof and animage-side surface being convex in a paraxial region thereof. The fifthlens element has negative refractive power. The sixth lens element haspositive refractive power. The imaging optical lens system has a totalof six lens elements, and the imaging optical lens system furthercomprises an aperture stop disposed between the second lens element andan image surface. When an axial distance between the aperture stop andthe image surface is SL, an axial distance between an object-sidesurface of the first lens element and the image surface is TL, thefollowing condition is satisfied:0.20<SL/TL<0.70.

BRIEF DESCRIPTION OF THE DRAWINGS

The disclosure can be better understood by reading the followingdetailed description of the embodiments, with reference made to theaccompanying drawings as follows:

FIG. 1 is a schematic view of an image capturing unit according to the1st embodiment of the present disclosure;

FIG. 2 shows spherical aberration curves, astigmatic field curves and adistortion curve of the image capturing unit according to the 1stembodiment;

FIG. 3 is a schematic view of an image capturing unit according to the2nd embodiment of the present disclosure;

FIG. 4 shows spherical aberration curves, astigmatic field curves and adistortion curve of the image capturing unit according to the 2ndembodiment;

FIG. 5 is a schematic view of an image capturing unit according to the3rd embodiment of the present disclosure;

FIG. 6 shows spherical aberration curves, astigmatic field curves and adistortion curve of the image capturing unit according to the 3rdembodiment;

FIG. 7 is a schematic view of an image capturing unit according to the4th embodiment of the present disclosure;

FIG. 8 shows spherical aberration curves, astigmatic field curves and adistortion curve of the image capturing unit according to the 4thembodiment;

FIG. 9 is a schematic view of an image capturing unit according to the5th embodiment of the present disclosure;

FIG. 10 shows spherical aberration curves, astigmatic field curves and adistortion curve of the image capturing unit according to the 5thembodiment;

FIG. 11 is a schematic view of an image capturing unit according to the6th embodiment of the present disclosure;

FIG. 12 shows spherical aberration curves, astigmatic field curves and adistortion curve of the image capturing unit according to the 6thembodiment;

FIG. 13 is a schematic view of an image capturing unit according to the7th embodiment of the present disclosure;

FIG. 14 shows spherical aberration curves, astigmatic field curves and adistortion curve of the image capturing unit according to the 7thembodiment;

FIG. 15 is a schematic view of an image capturing unit according to the8th embodiment of the present disclosure;

FIG. 16 shows spherical aberration curves, astigmatic field curves and adistortion curve of the image capturing unit according to the 8thembodiment;

FIG. 17 is a schematic view of an image capturing unit according to the9th embodiment of the present disclosure;

FIG. 18 shows spherical aberration curves, astigmatic field curves and adistortion curve of the image capturing unit according to the 9thembodiment;

FIG. 19 is a schematic view of an image capturing unit according to the10th embodiment of the present disclosure;

FIG. 20 shows spherical aberration curves, astigmatic field curves and adistortion curve of the image capturing unit according to the 10thembodiment;

FIG. 21 is a schematic view of an image capturing unit according to the11th embodiment of the present disclosure;

FIG. 22 shows spherical aberration curves, astigmatic field curves and adistortion curve of the image capturing unit according to the 11thembodiment;

FIG. 23 is a schematic view of an image capturing unit according to the12th embodiment of the present disclosure;

FIG. 24 shows spherical aberration curves, astigmatic field curves and adistortion curve of the image capturing unit according to the 12thembodiment;

FIG. 25 is a schematic view of an image capturing unit according to the13th embodiment of the present disclosure;

FIG. 26 shows spherical aberration curves, astigmatic field curves and adistortion curve of the image capturing unit according to the 13thembodiment;

FIG. 27 is a schematic view of Y11 and Y62 according to the 1stembodiment;

FIG. 28 shows an electronic device according to one embodiment;

FIG. 29 shows an electronic device according to another embodiment; and

FIG. 30 shows an electronic device according to still anotherembodiment.

DETAILED DESCRIPTION

An imaging optical lens system includes, in order from an object side toan image side, a first lens element, a second lens element, a third lenselement, a fourth lens element, a fifth lens element and a sixth lenselement. The imaging optical lens system has a total of six lenselements.

There can be an air gap in a paraxial region between every two lenselements of the imaging optical lens system that are adjacent to eachother; that is, each of the first through the sixth lens elements can bea single and non-cemented lens element. Due to the manufacturing processof the cemented lenses is more complex than the non-cemented lenses,particularly when an image-side surface of one lens element and anobject-side surface of the following lens element need to have accuratecurvature to ensure their highly cemented characteristic. However,during the cementing process, those two lens elements might not behighly cemented due to displacement and it is thereby not favorable forthe image quality. Therefore, there can be an air gap in a paraxialregion between every two lens elements of the imaging optical lenssystem that are adjacent to each other in the present disclosure forsolving the problem generated by the cemented lens elements.

The first lens element has negative refractive power. Therefore, it isfavorable for providing the imaging optical lens system with aretrofocus configuration for the light at large field of view totransmit into the imaging optical lens system.

The second lens element has an object-side surface being concave in aparaxial region thereof and an image-side surface being convex in aparaxial region thereof. Therefore, it is favorable for correctingaberrations generated by the first lens element with a large field ofview and providing sufficient brightness at the peripheral region of theimage.

The third lens element with positive refractive power can have anobject-side surface being convex in a paraxial region thereof.Therefore, it is favorable for balancing the arrangement of thecurvatures on the surfaces of the lens elements so as to improve theimage quality.

The fourth lens element with positive refractive power can have anobject-side surface being concave in a paraxial region thereof and animage-side surface being convex in a paraxial region thereof. Therefore,it is favorable for the third lens element and the fourth lens elementto provide sufficient light convergence capability so as to reduce atotal track length of the imaging optical lens system.

The fifth lens element has negative refractive power. Therefore, it isfavorable for balancing the refractive power among the third lenselement, the fourth lens element and the fifth lens element as well ascorrecting chromatic aberrations.

The sixth lens element has positive refractive power. Therefore, it isfavorable for providing sufficient light convergence capability on theimage side of the imaging optical lens system so as to enlarge the fieldof view. Furthermore, the sixth lens element can have an object-sidesurface being concave in a paraxial region thereof and an image sidesurface being convex in a paraxial region thereof so that it isfavorable for correcting astigmatism while improving the image qualityand keeping the imaging optical lens system compact. Moreover, the imageside surface of the sixth lens element can have at least one concaveshape in an off-axis region thereof so that it is favorable for reducinga back focal length of the imaging optical lens system, therebycorrecting the Petzval sum.

When a focal length of the second lens element is f2, a focal length ofthe third lens element is f3, the following condition is satisfied:−1.0<f3/f2<1.50. Therefore, it is favorable for properly arranging therefractive power distribution among the second lens element and thethird lens element so as to correct aberrations generated by the firstlens element while providing sufficient field for capturing image.Preferably, the following condition can also be satisfied:−1.0<f3/f2<1.0. More preferably, the following condition can also besatisfied: −0.50<f3/f2<0.60.

When a central thickness of the second lens element is CT2, a centralthickness of the third lens element is CT3, the following condition issatisfied: 0.80<CT2/CT3<7.50. Therefore, it is favorable for properlyarranging the central thicknesses of the second lens element and thethird lens element so as to reduce the sensitivity of the imagingoptical lens system. Preferably, the following condition can also besatisfied: 1.20<CT2/CT3<7.50.

When a focal length of the imaging optical lens system is f, an axialdistance between the first lens element and the second lens element isT12, the following condition is satisfied: 0<f/T12<1.50. Therefore, itis favorable for obtaining a lens configuration with large field of viewand short focal length so as to correct axial chromatic aberration.Furthermore, it is favorable for arranging sufficient axial distancebetween the first lens element and the second lens element so as toobtain an easier assembling process. Preferably, the following conditioncan also be satisfied: 0<f/T12<1.35. More preferably, the followingcondition can also be satisfied: 0<f/T12<0.80.

When a central thickness of the fifth lens element is CT5, a centralthickness of the sixth lens element is CT6, the following condition issatisfied: 0.20<CT6/CT5<7.0. Therefore, it is favorable for properlyarranging the central thicknesses of the fifth lens element and thesixth lens element so as to prevent the imbalance of the arrangement ofthe lens elements in the imaging optical lens system, thereby improvingthe image quality. Preferably, the following condition can also besatisfied: 0.20<CT6/CT5<6.50.

When a curvature radius of an object-side surface of the fifth lenselement is R9, a curvature radius of an image-side surface of the fifthlens element is R10, the following condition is satisfied:−8.0<(R9+R10)/(R9−R10)<0. Therefore, it is favorable for properlyarranging the shape of the fifth lens element so as to reducing thetotal track length of the imaging optical lens system while providingsufficient negative refractive power for correcting chromaticaberrations. Preferably, the following condition can also be satisfied:−2.3<(R9+R10)/(R9−R10)<0.

According to the present disclosure, the imaging optical lens system caninclude an aperture stop disposed between the second lens element and animage surface. When an axial distance between the aperture stop and theimage surface is SL, an axial distance between an object-side surface ofthe first lens element and the image surface is TL, the followingcondition is satisfied: 0.20<SL/TL<0.70. Therefore, it is favorable forarranging the position of the aperture stop for the light at large fieldof view to transmit into the imaging optical lens system so as toimprove the wide angle performance.

When an axial distance between the fourth lens element and the fifthlens element is T45, an axial distance between the fifth lens elementand the sixth lens element is T56, the following condition can besatisfied: 0<T56/T45<5.5. Therefore, it is favorable for arrangingproper distances among the lens elements closer to the image side of theimaging optical lens system so as to easily assemble the lens elements,thereby increasing the manufacturing yield rate.

When a maximum effective radius of the object-side surface of the firstlens element is Y11, a maximum effective radius of the image-sidesurface of the sixth lens element is Y62, the following condition can besatisfied: |Y62/Y11|<1.5. Therefore, it is favorable for improve theretrofocus performance for the light at larger field of view to transmitinto the imaging optical lens system. Preferably, the followingcondition can also be satisfied: |Y62/Y11|<0.55. As shown in FIG. 27being a schematic view of Y11 and Y62 according to the 1st embodiment.

When half of a maximal field of view of the imaging optical lens systemis HFOV, the following condition can be satisfied: |1/tan(HFOV)|<0.50.Therefore, it is favorable for enlarging the field of view so that theimaging optical lens system becomes applicable to more applications.

When the central thickness of the second lens element is CT2, acurvature radius of the object-side surface of the second lens elementis R3, a curvature radius of the image-side surface of the second lenselement is R4, the following condition can be satisfied:−2.5<(CT2/R3)+(CT2/R4)<−0.75. Therefore, it is favorable for properlyarranging the central thickness of the second lens element and thecurvature on the surfaces thereof so as to increase the manufacturingyield rate and correct aberrations.

When a curvature radius of the object-side surface of the sixth lenselement is R11, a curvature radius of the image-side surface of thesixth lens element is R12, the following condition can be satisfied:0<(R11+R12)/(R11−R12)<5.5. Therefore, it is favorable for arranging theshape of the sixth lens element so as to further enlarge the field ofview and reduce the total track length.

According to the present disclosure, the lens elements of the imagingoptical lens system can be made of glass or plastic material. When thelens elements are made of glass material, the refractive powerdistribution of the imaging optical lens system may be more flexible todesign. When the lens elements are made of plastic material,manufacturing costs can be effectively reduced. Furthermore, surfaces ofeach lens element can be arranged to be aspheric, since the asphericsurface of the lens element is easy to form a shape other than aspherical surface so as to have more controllable variables foreliminating aberrations thereof and to further decrease the requirednumber of the lens elements. Therefore, the total track length of theimaging optical lens system can also be reduced.

According to the present disclosure, each of an object-side surface andan image-side surface has a paraxial region and an off-axial region. Theparaxial region refers to the region of the surface where light raystravel close to the optical axis, and the off-axial region refers to theregion of the surface away from the paraxial region. Particularly unlessotherwise stated, when the lens element has a convex surface, itindicates that the surface can be convex in the paraxial region thereof;when the lens element has a concave surface, it indicates that thesurface can be concave in the paraxial region thereof. Moreover, when aregion of refractive power or focus of a lens element is not defined, itindicates that the region of refractive power or focus of the lenselement can be in the paraxial region thereof.

According to the present disclosure, an image surface of the imagingoptical lens system on the corresponding image sensor can be flat orcurved, particularly a concave curved surface facing towards the objectside of the imaging optical lens system.

According to the present disclosure, the imaging optical lens system caninclude at least one stop, such as an aperture stop, a glare stop or afield stop. Said glare stop or said field stop is allocated foreliminating the stray light and thereby improving the image qualitythereof.

According to the present disclosure, an aperture stop can be adapted fora front stop or a middle stop. A front stop disposed between the imagedobject and the first lens element can produce a telecentric effect byproviding a longer distance between an exit pupil and the image surface,thereby improving the image-sensing efficiency of an image sensor (forexample, CCD or CMOS). A middle stop disposed between the first lenselement and the image surface is favorable for enlarging the view angleand thereby provides a wider field of view.

According to the present disclosure, an image capturing unit includesthe aforementioned imaging optical lens system and an image sensor,wherein the image sensor is disposed on the image side and can belocated on or near an image surface of the aforementioned imagingoptical lens system. In some embodiments, the image capturing unit canfurther include a barrel member, a holding member or a combinationthereof.

In FIG. 28, FIG. 29 and FIG. 30, an image capturing unit 10 may beinstalled in, but not limited to, an electronic device, including avehicle backup camera (FIG. 28), a network surveillance device (FIG. 29)or a dashboard camera (FIG. 30). The electronic devices shown in thefigures are only exemplary for showing the image capturing unit of thepresent disclosure installed in an electronic device and are not limitedthereto. In some embodiments, the electronic device can further include,but not limited to, a display unit, a control unit, a storage unit, arandom access memory unit (RAM), a read only memory unit (ROM) or acombination thereof.

According to the present disclosure, the imaging optical lens system canbe optionally applied to optical systems with a movable focus.Furthermore, the imaging optical lens system is featured with goodcapability in aberration corrections and high image quality, and can beapplied to 3D (three-dimensional) image capturing applications, inproducts such as digital cameras, mobile devices, digital tablets,wearable devices, smart televisions, network surveillance devices,motion sensing input devices, dashboard cameras, vehicle backup camerasand other electronic imaging devices. According to the above descriptionof the present disclosure, the following specific embodiments areprovided for further explanation.

1st Embodiment

FIG. 1 is a schematic view of an image capturing unit according to the1st embodiment of the present disclosure. FIG. 2 shows, in order fromleft to right, spherical aberration curves, astigmatic field curves anda distortion curve of the image capturing unit according to the 1stembodiment. In FIG. 1, the image capturing unit includes the imagingoptical lens system (its reference numeral is omitted) of the presentdisclosure and an image sensor 190. The imaging optical lens systemincludes, in order from an object side to an image side, a first lenselement 110, a second lens element 120, an aperture stop 100, a thirdlens element 130, a fourth lens element 140, a fifth lens element 150, asixth lens element 160, an IR-cut filter 170 and an image surface 180,wherein the imaging optical lens system has a total of six lens elements(110-160).

The first lens element 110 with negative refractive power has anobject-side surface 111 being convex in a paraxial region thereof and animage-side surface 112 being concave in a paraxial region thereof. Thefirst lens element 110 is made of plastic material and has theobject-side surface 111 and the image-side surface 112 being bothaspheric.

The second lens element 120 with negative refractive power has anobject-side surface 121 being concave in a paraxial region thereof andan image-side surface 122 being convex in a paraxial region thereof. Thesecond lens element 120 is made of plastic material and has theobject-side surface 121 and the image-side surface 122 being bothaspheric.

The third lens element 130 with positive refractive power has anobject-side surface 131 being convex in a paraxial region thereof and animage-side surface 132 being convex in a paraxial region thereof. Thethird lens element 130 is made of plastic material and has theobject-side surface 131 and the image-side surface 132 being bothaspheric.

The fourth lens element 140 with positive refractive power has anobject-side surface 141 being concave in a paraxial region thereof andan image-side surface 142 being convex in a paraxial region thereof. Thefourth lens element 140 is made of plastic material and has theobject-side surface 141 and the image-side surface 142 being bothaspheric.

The fifth lens element 150 with negative refractive power has anobject-side surface 151 being concave in a paraxial region thereof andan image-side surface 152 being convex in a paraxial region thereof. Thefifth lens element 150 is made of plastic material and has theobject-side surface 151 and the image-side surface 152 being bothaspheric.

The sixth lens element 160 with positive refractive power has anobject-side surface 161 being concave in a paraxial region thereof andan image-side surface 162 being convex in a paraxial region thereof. Thesixth lens element 160 is made of plastic material and has theobject-side surface 161 and the image-side surface 162 being bothaspheric. The image-side surface 162 of the sixth lens element 160 hasat least one concave shape in an off-axis region thereof.

The IR-cut filter 170 is made of glass material and located between thesixth lens element 160 and the image surface 180, and will not affectthe focal length of the imaging optical lens system. The image sensor190 is disposed on or near the image surface 180 of the imaging opticallens system.

The equation of the aspheric surface profiles of the aforementioned lenselements of the 1st embodiment is expressed as follows:

${{X(Y)} = {{\left( {Y^{2}/R} \right)/\left( {1 + {{sqrt}\left( {1 - {\left( {1 + k} \right) \times \left( {Y/R} \right)^{2}}} \right)}} \right)} + {\sum\limits_{i}\;{({Ai}) \times \left( Y^{i} \right)}}}},$where,

X is the relative distance between a point on the aspheric surfacespaced at a distance Y from an optical axis and the tangential plane atthe aspheric surface vertex on the optical axis;

Y is the vertical distance from the point on the aspheric surface to theoptical axis;

R is the curvature radius;

k is the conic coefficient; and

Ai is the i-th aspheric coefficient, and in the embodiments, i may be,but is not limited to, 4, 6, 8, 10, 12, 14 and 16.

In the imaging optical lens system of the image capturing unit accordingto the 1st embodiment, when a focal length of the imaging optical lenssystem is f, an f-number of the imaging optical lens system is Fno, andhalf of a maximal field of view of the imaging optical lens system isHFOV, these parameters have the following values: f=1.30 millimeters(mm); Fno=2.20; and HFOV=98.0 degrees (deg.).

When half of the maximal field of view of the imaging optical lenssystem is HFOV, the following condition is satisfied:|1/tan(HFOV)|=0.14.

When an axial distance between the fourth lens element 140 and the fifthlens element 150 is T45, an axial distance between the fifth lenselement 150 and the sixth lens element 160 is T56, the followingcondition is satisfied: T56/T45=0.30.

When a central thickness of the second lens element 120 is CT2, acentral thickness of the third lens element 130 is CT3, the followingcondition is satisfied: CT2/CT3=1.66.

When a central thickness of the fifth lens element 150 is CT5, a centralthickness of the sixth lens element 160 is CT6, the following conditionis satisfied: CT6/CT5=3.80.

When the central thickness of the second lens element 120 is CT2, acurvature radius of the object-side surface 121 of the second lenselement 120 is R3, a curvature radius of the image-side surface 122 ofthe second lens element 120 is R4, the following condition is satisfied:(CT2/R3)+(CT2/R4)=−1.14.

When a curvature radius of the object-side surface 151 of the fifth lenselement 150 is R9, a curvature radius of the image-side surface 152 ofthe fifth lens element 150 is R10, the following condition is satisfied:(R9+R10)/(R9−R10)=−1.29.

When a curvature radius of the object-side surface 161 of the sixth lenselement 160 is R11, a curvature radius of the image-side surface 162 ofthe sixth lens element 160 is R12, the following condition is satisfied:(R11+R12)/(R11−R12)=1.32.

When the focal length of the imaging optical lens system is f, an axialdistance between the first lens element 110 and the second lens element120 is T12, the following condition is satisfied: f/T12=0.65.

When a focal length of the second lens element 120 is f2, a focal lengthof the third lens element 130 is f3, the following condition issatisfied: f3/f2=−0.06.

When an axial distance between the aperture stop 100 and the imagesurface 180 is SL, an axial distance between the object-side surface 111of the first lens element 110 and the image surface 180 is TL, thefollowing condition is satisfied: SL/TL=0.50.

When a maximum effective radius of the object-side surface 111 of thefirst lens element 110 is Y11, a maximum effective radius of theimage-side surface 162 of the sixth lens element 160 is Y62, thefollowing condition is satisfied: |Y62/Y11|=0.40.

The detailed optical data of the 1st embodiment are shown in Table 1 andthe aspheric surface data are shown in Table 2 below.

TABLE 1 1st Embodiment f = 1.30 mm, Fno = 2.20, HFOV = 98.0 deg. FocalSurface # Curvature Radius Thickness Material Index Abbe # Length 0Object Plano Infinity 1 Lens 1 9.372 (ASP) 0.771 Plastic 1.535 55.8−6.75 2 2.532 (ASP) 2.006 3 Lens 2 −1.599 (ASP) 1.048 Plastic 1.544 56.0−30.4 4 −2.178 (ASP) 0.665 5 Ape. Stop Plano 0.057 6 Lens 3 2.346 (ASP)0.633 Plastic 1.535 55.8 1.77 7 −1.438 (ASP) 0.219 8 Lens 4 −1.978 (ASP)0.942 Plastic 1.535 55.8 1.52 9 −0.672 (ASP) 0.165 10 Lens 5 −0.520(ASP) 0.300 Plastic 1.639 23.5 −0.96 11 −4.119 (ASP) 0.050 12 Lens 6−5.692 (ASP) 1.139 Plastic 1.544 56.0 1.56 13 −0.791 (ASP) 0.050 14IR-cut filter Plano 0.300 Glass 1.517 64.2 — 15 Plano 0.650 16 ImagePlano — Note: Reference wavelength is 587.6 nm (d-line).

TABLE 2 Aspheric Coefficients Surface # 1 2 3 4 6 7 k = −1.1333E+004.5695E−01 −8.9258E−01 −1.6234E+00 −1.9949E+01 −4.4921E+00 A4 =1.0707E−03 −5.3021E−03 4.6020E−02 8.6146E−02 2.5133E−01 6.2420E−02 A6 =−6.3694E−05 2.6378E−03 3.8413E−03 −2.9275E−02 −5.6453E−01 −6.7775E−01 A8= — — −2.7740E−03 4.2555E−02 1.7357E+00 1.6569E+00 A10 = — — 1.2395E−04−1.9429E−02 −4.8970E+00 −3.5854E+00 A12 = — — — — 4.2472E+00 2.3244E+00Surface # 8 9 10 11 12 13 k = −5.7012E+00 −1.6815E+00 −1.1763E+003.4876E+00 4.1727E+00 −1.8571E+00 A4 = 1.6563E−01 4.1948E−01 4.8429E−01−2.1619E−01 1.5376E−01 1.4973E−01 A6 = −5.7413E−01 −4.6713E−01−4.2238E−01 6.4159E−01 2.6768E−02 9.7320E−02 A8 = −4.2888E−02−5.6339E−01 2.8142E−01 −4.8961E−01 −4.7176E−02 −2.3960E−01 A10 =−2.6358E−02 1.2353E+00 −1.1807E−01 1.4476E−01 1.3688E−02 1.8413E−01 A12= — −6.0106E−01 — −1.1450E−02 1.3112E−03 −5.6926E−02 A14 = — — — —−8.2218E−04 5.9674E−03

In Table 1, the curvature radius, the thickness and the focal length areshown in millimeters (mm). Surface numbers 0-16 represent the surfacessequentially arranged from the object-side to the image-side along theoptical axis. In Table 2, k represents the conic coefficient of theequation of the aspheric surface profiles. A4-A14 represent the asphericcoefficients ranging from the 4th order to the 14th order. The tablespresented below for each embodiment are the corresponding schematicparameter and aberration curves, and the definitions of the terms in thetables are the same as Table 1 and Table 2 of the 1st embodiment.Therefore, an explanation in this regard will not be provided again.

2nd Embodiment

FIG. 3 is a schematic view of an image capturing unit according to the2nd embodiment of the present disclosure. FIG. 4 shows, in order fromleft to right, spherical aberration curves, astigmatic field curves anda distortion curve of the image capturing unit according to the 2ndembodiment. In FIG. 3, the image capturing unit includes the imagingoptical lens system (its reference numeral is omitted) of the presentdisclosure and an image sensor 290. The imaging optical lens systemincludes, in order from an object side to an image side, a first lenselement 210, a second lens element 220, an aperture stop 200, a thirdlens element 230, a fourth lens element 240, a fifth lens element 250, asixth lens element 260, an IR-cut filter 270 and an image surface 280,wherein the imaging optical lens system has a total of six lens elements(210-260).

The first lens element 210 with negative refractive power has anobject-side surface being 211 convex in a paraxial region thereof and animage-side surface 212 being concave in a paraxial region thereof. Thefirst lens element 210 is made of plastic material and has theobject-side surface 211 and the image-side surface 212 being bothaspheric.

The second lens element 220 with negative refractive power has anobject-side surface 221 being concave in a paraxial region thereof andan image-side surface 222 being convex in a paraxial region thereof. Thesecond lens element 220 is made of plastic material and has theobject-side surface 221 and the image-side surface 222 being bothaspheric.

The third lens element 230 with positive refractive power has anobject-side surface 231 being convex in a paraxial region thereof and animage-side surface 232 being convex in a paraxial region thereof. Thethird lens element 230 is made of plastic material and has theobject-side surface 231 and the image-side surface 232 being bothaspheric.

The fourth lens element 240 with positive refractive power has anobject-side surface 241 being concave in a paraxial region thereof andan image-side surface 242 being convex in a paraxial region thereof. Thefourth lens element 240 is made of plastic material and has theobject-side surface 241 and the image-side surface 242 being bothaspheric.

The fifth lens element 250 with negative refractive power has anobject-side surface 251 being concave in a paraxial region thereof andan image-side surface 252 being convex in a paraxial region thereof. Thefifth lens element 250 is made of plastic material and has theobject-side surface 251 and the image-side surface 252 being bothaspheric.

The sixth lens element 260 with positive refractive power has anobject-side surface 261 being concave in a paraxial region thereof andan image-side surface 262 being convex in a paraxial region thereof. Thesixth lens element 260 is made of plastic material and has theobject-side surface 261 and the image-side surface 262 being bothaspheric. The image-side surface 262 of the sixth lens element 260 hasat least one concave shape in an off-axis region thereof.

The IR-cut filter 270 is made of glass material and located between thesixth lens element 260 and the image surface 280, and will not affectthe focal length of the imaging optical lens system. The image sensor290 is disposed on or near the image surface 280 of the imaging opticallens system.

The detailed optical data of the 2nd embodiment are shown in Table 3 andthe aspheric surface data are shown in Table 4 below.

TABLE 3 2nd Embodiment f = 1.30 mm, Fno = 2.20, HFOV = 98.0 deg. FocalSurface # Curvature Radius Thickness Material Index Abbe # Length 0Object Plano Infinity 1 Lens 1 8.616 (ASP) 0.619 Plastic 1.535 55.8−6.65 2 2.456 (ASP) 2.125 3 Lens 2 −1.596 (ASP) 1.069 Plastic 1.544 56.0−31.92 4 −2.173 (ASP) 0.655 5 Ape. Stop Plano 0.054 6 Lens 3 2.350 (ASP)0.639 Plastic 1.535 55.8 1.77 7 −1.432 (ASP) 0.218 8 Lens 4 −2.050 (ASP)0.967 Plastic 1.535 55.8 1.53 9 −0.680 (ASP) 0.156 10 Lens 5 −0.528(ASP) 0.300 Plastic 1.639 23.5 −0.95 11 −4.884 (ASP) 0.050 12 Lens 6−5.850 (ASP) 1.139 Plastic 1.544 56.0 1.59 13 −0.803 (ASP) 0.052 14IR-cut filter Plano 0.300 Glass 1.517 64.2 — 15 Plano 0.656 16 ImagePlano — Note: Reference wavelength is 587.6 nm (d-line).

TABLE 4 Aspheric Coefficients Surface # 1 2 3 4 6 7 k = −4.8872E−014.1572E−01 −8.6027E−01 −1.5523E+00 −1.9960E+01 −4.4924E+00 A4 =1.2584E−03 −5.8749E−03 4.4495E−02 8.3941E−02 2.5185E−01 6.6536E−02 A6 =−9.1576E−05 2.7724E−03 4.6145E−03 −2.5457E−02 −5.4369E−01 −6.8321E−01 A8= — — −2.4046E−03 4.0628E−02 1.5069E+00 1.4822E+00 A10 = — — −1.1564E−04−2.0448E−02 −4.0096E+00 −2.9408E+00 A12 = — — — — 3.1105E+00 1.7176E+00Surface # 8 9 10 11 12 13 k = −5.7045E+00 −1.6796E+00 −1.1768E+004.3340E+00 6.0663E+00 −1.8537E+00 A4 = 1.7037E−01 4.3304E−01 4.8987E−01−2.2273E−01 1.4113E−01 1.5232E−01 A6 = −5.9222E−01 −5.6695E−01−4.5409E−01 6.7460E−01 6.3765E−02 8.3775E−02 A8 = −3.9692E−02−3.1208E−01 3.3865E−01 −5.4249E−01 −8.9602E−02 −2.2716E−01 A10 =1.7446E−03 9.6137E−01 −1.4937E−01 1.7902E−01 3.7543E−02 1.7964E−01 A12 =— −4.9276E−01 — −1.9459E−02 −5.3096E−03 −5.6933E−02 A14 = — — — —−1.1216E−04 6.1534E−03

In the 2nd embodiment, the equation of the aspheric surface profiles ofthe aforementioned lens elements is the same as the equation of the 1stembodiment. Also, the definitions of these parameters shown in thefollowing table are the same as those stated in the 1st embodiment withcorresponding values for the 2nd embodiment, so an explanation in thisregard will not be provided again.

Moreover, these parameters can be calculated from Table 3 and Table 4 asthe following values and satisfy the following conditions:

2nd Embodiment f [mm] 1.30 (CT2/R3) + (CT2/R4) −1.16 Fno 2.20 (R9 +R10)/(R9 − R10) −1.24 HFOV [deg.] 98.0 (R11 + R12)/(R11 − R12) 1.32|1/tan(HFOV)| 0.14 f/T12 0.61 T56/T45 0.32 f3/f2 −0.06 CT2/CT3 1.67SL/TL 0.50 CT6/CT5 3.80 |Y62/Y11| 0.42

3rd Embodiment

FIG. 5 is a schematic view of an image capturing unit according to the3rd embodiment of the present disclosure. FIG. 6 shows, in order fromleft to right, spherical aberration curves, astigmatic field curves anda distortion curve of the image capturing unit according to the 3rdembodiment. In FIG. 5, the image capturing unit includes the imagingoptical lens system (its reference numeral is omitted) of the presentdisclosure and an image sensor 390. The imaging optical lens systemincludes, in order from an object side to an image side, a first lenselement 310, a second lens element 320, a third lens element 330, anaperture stop 300, a fourth lens element 340, a fifth lens element 350,a sixth lens element 360, an IR-cut filter 370 and an image surface 380,wherein the imaging optical lens system has a total of six lens elements(310-360).

The first lens element 310 with negative refractive power has anobject-side surface 311 being convex in a paraxial region thereof and animage-side surface 312 being concave in a paraxial region thereof. Thefirst lens element 310 is made of plastic material and has theobject-side surface 311 and the image-side surface 312 being bothaspheric.

The second lens element 320 with negative refractive power has anobject-side surface 321 being concave in a paraxial region thereof andan image-side surface 322 being convex in a paraxial region thereof. Thesecond lens element 320 is made of plastic material and has theobject-side surface 321 and the image-side surface 322 being bothaspheric.

The third lens element 330 with positive refractive power has anobject-side surface 331 being convex in a paraxial region thereof and animage-side surface 332 being convex in a paraxial region thereof. Thethird lens element 330 is made of plastic material and has theobject-side surface 331 and the image-side surface 332 being bothaspheric.

The fourth lens element 340 with positive refractive power has anobject-side surface 341 being concave in a paraxial region thereof andan image-side surface 342 being convex in a paraxial region thereof. Thefourth lens element 340 is made of plastic material and has theobject-side surface 341 and the image-side surface 342 being bothaspheric.

The fifth lens element 350 with negative refractive power has anobject-side surface 351 being concave in a paraxial region thereof andan image-side surface 352 being convex in a paraxial region thereof. Thefifth lens element 350 is made of plastic material and has theobject-side surface 351 and the image-side surface 352 being bothaspheric.

The sixth lens element 360 with positive refractive power has anobject-side surface 361 being concave in a paraxial region thereof andan image-side surface 362 being convex in a paraxial region thereof. Thesixth lens element 360 is made of plastic material and has theobject-side surface 361 and the image-side surface 362 being bothaspheric. The image-side surface 362 of the sixth lens element 360 hasat least one concave shape in an off-axis region thereof.

The IR-cut filter 370 is made of glass material and located between thesixth lens element 360 and the image surface 380, and will not affectthe focal length of the imaging optical lens system. The image sensor390 is disposed on or near the image surface 380 of the imaging opticallens system.

The detailed optical data of the 3rd embodiment are shown in Table 5 andthe aspheric surface data are shown in Table 6 below.

TABLE 5 3rd Embodiment f = 1.25 mm, Fno = 2.20, HFOV = 100.0 deg. FocalSurface # Curvature Radius Thickness Material Index Abbe # Length 0Object Plano Infinity 1 Lens 1 9.505 (ASP) 0.600 Plastic 1.544 55.9−3.16 2 1.422 (ASP) 1.966 3 Lens 2 −2.330 (ASP) 1.272 Plastic 1.639 23.3−15.29 4 −3.710 (ASP) 1.005 5 Lens 3 2.027 (ASP) 0.590 Plastic 1.54455.9 2.00 6 −2.111 (ASP) −0.135 7 Ape. Stop Plano 0.758 8 Lens 4 −2.811(ASP) 0.662 Plastic 1.544 55.9 1.63 9 −0.730 (ASP) 0.074 10 Lens 5−0.911 (ASP) 0.465 Plastic 1.660 20.4 −1.41 11 −47.461 (ASP) 0.050 12Lens 6 −3.131 (ASP) 0.870 Plastic 1.544 55.9 6.19 13 −1.781 (ASP) 0.70014 IR-cut filter Plano 0.300 Glass 1.517 64.2 — 15 Plano 0.310 16 ImagePlano — Note: Reference wavelength is 587.6 nm (d-line).

TABLE 6 Aspheric Coefficients Surface # 1 2 3 4 5 6 k = −2.4560E−01−3.5482E−01 −2.8311E−01 4.8135E−01 −8.4992E+00 −1.4113E+01 A4 =3.0401E−03 4.2970E−03 −6.6808E−04 1.5692E−02 7.9332E−02 −1.5916E−01 A6 =−6.1081E−04 6.7695E−03 −1.6167E−02 −1.5204E−02 −9.4550E−03 1.6068E−01 A8= 4.2464E−05 −1.5479E−04 2.2608E−02 4.5301E−02 −2.7974E−01 −1.9548E−01A10 = −1.1308E−06 −1.2787E−04 −7.7159E−03 −2.9029E−02 5.0778E−011.0185E−01 A12 = — — 8.9159E−04 9.2632E−03 −3.8331E−01 −6.5929E−02Surface # 8 9 10 11 12 13 k = −2.8692E+01 −1.9163E+00 −1.0327E+00−3.3112E+01 −9.0000E+01 −1.0047E+01 A4 = −8.2777E−02 7.6689E−015.9848E−01 1.3780E−01 5.1984E−01 1.1660E−01 A6 = 2.7059E−01 −1.7877E+00−1.3240E+00 −1.0156E−01 −6.8918E−01 −2.3969E−02 A8 = −1.0401E+001.6574E+00 1.5062E+00 6.2101E−02 5.6608E−01 −3.4978E−02 A10 = 1.3013E+00−6.8816E−01 −7.7505E−01 −1.3960E−04 −2.9033E−01 3.1574E−02 A12 =−6.8491E−01 5.3425E−02 1.2058E−01 −8.8703E−03 8.5420E−02 −1.2138E−02 A14= — — — — −1.0882E−02 1.9390E−03

In the 3rd embodiment, the equation of the aspheric surface profiles ofthe aforementioned lens elements is the same as the equation of the 1stembodiment. Also, the definitions of these parameters shown in thefollowing table are the same as those stated in the 1st embodiment withcorresponding values for the 3rd embodiment, so an explanation in thisregard will not be provided again.

Moreover, these parameters can be calculated from Table 5 and Table 6 asthe following values and satisfy the following conditions:

3rd Embodiment f [mm] 1.25 (CT2/R3) + (CT2/R4) −0.89 Fno 2.20 (R9 +R10)/(R9 − R10) −1.04 HFOV [deg.] 100.0 (R11 + R12)/(R11 − R12) 3.64|1/tan(HFOV)| 0.18 f/T12 0.63 T56/T45 0.68 f3/f2 −0.13 CT2/CT3 2.16SL/TL 0.44 CT6/CT5 1.87 |Y62/Y11| 0.41

4th Embodiment

FIG. 7 is a schematic view of an image capturing unit according to the4th embodiment of the present disclosure. FIG. 8 shows, in order fromleft to right, spherical aberration curves, astigmatic field curves anda distortion curve of the image capturing unit according to the 4thembodiment. In FIG. 7, the image capturing unit includes the imagingoptical lens system (its reference numeral is omitted) of the presentdisclosure and an image sensor 490. The imaging optical lens systemincludes, in order from an object side to an image side, a first lenselement 410, a second lens element 420, a third lens element 430, anaperture stop 400, a fourth lens element 440, a fifth lens element 450,a sixth lens element 460, a IR-cut filter 470 and an image surface 480,wherein the imaging optical lens system has a total of six lens elements(410-460).

The first lens element 410 with negative refractive power has anobject-side surface 411 being convex in a paraxial region thereof and animage-side surface 412 being concave in a paraxial region thereof. Thefirst lens element 410 is made of plastic material and has theobject-side surface 411 and the image-side surface 412 being bothaspheric.

The second lens element 420 with positive refractive power has anobject-side surface 421 being concave in a paraxial region thereof andan image-side surface 422 being convex in a paraxial region thereof. Thesecond lens element 420 is made of plastic material and has theobject-side surface 421 and the image-side surface 422 being bothaspheric.

The third lens element 430 with positive refractive power has anobject-side surface 431 being convex in a paraxial region thereof and animage-side surface 432 being convex in a paraxial region thereof. Thethird lens element 430 is made of plastic material and has theobject-side surface 431 and the image-side surface 432 being bothaspheric.

The fourth lens element 440 with positive refractive power has anobject-side surface 441 being concave in a paraxial region thereof andan image-side surface 442 being convex in a paraxial region thereof. Thefourth lens element 440 is made of plastic material and has theobject-side surface 441 and the image-side surface 442 being bothaspheric.

The fifth lens element 450 with negative refractive power has anobject-side surface 451 being concave in a paraxial region thereof andan image-side surface 452 being concave in a paraxial region thereof.The fifth lens element 450 is made of plastic material and has theobject-side surface 451 and the image-side surface 452 being bothaspheric.

The sixth lens element 460 with positive refractive power has anobject-side surface 461 being concave in a paraxial region thereof andan image-side surface 462 being convex in a paraxial region thereof. Thesixth lens element 460 is made of plastic material and has theobject-side surface 461 and the image-side surface 462 being bothaspheric. The image-side surface 462 of the sixth lens element 460 hasat least one concave shape in an off-axis region thereof.

The IR-cut filter 470 is made of glass material and located between thesixth lens element 460 and the image surface 480, and will not affectthe focal length of the imaging optical lens system. The image sensor490 is disposed on or near the image surface 480 of the imaging opticallens system.

The detailed optical data of the 4th embodiment are shown in Table 7 andthe aspheric surface data are shown in Table 8 below.

TABLE 7 4th Embodiment f = 1.24 mm, Fno = 2.20, HFOV = 100.0 deg. FocalSurface # Curvature Radius Thickness Material Index Abbe # Length 0Object Plano Infinity 1 Lens 1 9.413 (ASP) 0.600 Plastic 1.544 55.9−2.81 2 1.286 (ASP) 1.922 3 Lens 2 −2.240 (ASP) 1.500 Plastic 1.639 23.342.25 4 −2.608 (ASP) 0.849 5 Lens 3 2.859 (ASP) 0.579 Plastic 1.544 55.92.33 6 −2.104 (ASP) −0.155 7 Ape. Stop Plano 0.716 8 Lens 4 −2.983 (ASP)0.556 Plastic 1.544 55.9 2.07 9 −0.870 (ASP) 0.045 10 Lens 5 −1.107(ASP) 0.289 Plastic 1.660 20.4 −1.57 11 17.868 (ASP) 0.042 12 Lens 6−17.259 (ASP) 0.805 Plastic 1.544 55.9 5.64 13 −2.645 (ASP) 1.000 14IR-cut filter Plano 0.300 Glass 1.517 64.2 — 15 Plano 0.440 16 ImagePlano — — Note: Reference wavelength is 587.6 nm (d-line).

TABLE 8 Aspheric Coefficients Surface # 1 2 3 4 5 6 k = −4.5331E−01−4.2807E−01 −2.7480E−01 −2.2372E+00 −1.0109E+01 −1.1342E+01 A4 =2.9919E−03 −4.5597E−03 −3.6969E−02 5.8007E−03 1.9953E−02 −1.8338E−01 A6= −6.1321E−04 −8.2262E−03 2.9598E−02 2.3265E−02 4.3551E−02 2.0031E−01 A8= 4.2433E−05 4.8312E−03 3.8037E−03 7.8159E−03 −1.5690E−01 −1.5988E−01A10 = −1.1064E−06 −2.1728E−03 −5.1683E−03 −8.5664E−03 2.3395E−012.2522E−02 A12 = — — 8.9896E−04 5.1265E−03 −1.7660E−01 −5.3636E−03Surface # 8 9 10 11 12 13 k = −1.7884E+00 −2.8543E+00 −1.2180E+00−3.3112E+01 −9.0000E+01 −1.0047E+01 A4 = 9.6899E−03 5.0871E−014.5497E−01 7.7111E−02 4.6102E−01 5.4581E−02 A6 = 1.8496E−01 −1.2960E+00−1.4942E+00 −1.6968E−01 −5.4704E−01 3.4272E−02 A8 = −1.8385E−011.8135E+00 2.4480E+00 2.4522E−01 4.3032E−01 1.0845E−02 A10 = −1.6563E−01−1.2768E+00 −1.7043E+00 −1.2730E−01 −2.1227E−01 −5.4160E−02 A12 =1.0102E−01 3.1478E−01 4.1829E−01 2.0458E−02 6.0712E−02 3.4556E−02 A14 =— — — — −7.6500E−03 −6.7148E−03

In the 4th embodiment, the equation of the aspheric surface profiles ofthe aforementioned lens elements is the same as the equation of the 1stembodiment. Also, the definitions of these parameters shown in thefollowing table are the same as those stated in the 1st embodiment withcorresponding values for the 4th embodiment, so an explanation in thisregard will not be provided again.

Moreover, these parameters can be calculated from Table 7 and Table 8 asthe following values and satisfy the following conditions:

4th Embodiment f [mm] 1.24 (CT2/R3) + (CT2/R4) −1.24 Fno 2.20 (R9 +R10)/(R9 − R10) −0.88 HFOV [deg.] 100.0 (R11 + R12)/(R11 − R12) 1.36|1/tan(HFOV)| 0.18 f/T12 0.65 T56/T45 0.93 f3/f2 0.06 CT2/CT3 2.59 SL/TL0.44 CT6/CT5 2.79 |Y62/Y11| 0.41

5th Embodiment

FIG. 9 is a schematic view of an image capturing unit according to the5th embodiment of the present disclosure. FIG. 10 shows, in order fromleft to right, spherical aberration curves, astigmatic field curves anda distortion curve of the image capturing unit according to the 5thembodiment. In FIG. 9, the image capturing unit includes the imagingoptical lens system (its reference numeral is omitted) of the presentdisclosure and an image sensor 590. The imaging optical lens systemincludes, in order from an object side to an image side, a first lenselement 510, a second lens element 520, an aperture stop 500, a thirdlens element 530, a fourth lens element 540, a fifth lens element 550, asixth lens element 560, an IR-cut filter 570 and an image surface 580,wherein the imaging optical lens system has a total of six lens elements(510-560).

The first lens element 510 with negative refractive power has anobject-side surface 511 being convex in a paraxial region thereof and animage-side surface 512 being concave in a paraxial region thereof. Thefirst lens element 510 is made of plastic material and has theobject-side surface 511 and the image-side surface 512 being bothaspheric.

The second lens element 520 with positive refractive power has anobject-side surface 521 being concave in a paraxial region thereof andan image-side surface 522 being convex in a paraxial region thereof. Thesecond lens element 520 is made of plastic material and has theobject-side surface 521 and the image-side surface 522 being bothaspheric.

The third lens element 530 with positive refractive power has anobject-side surface 531 being concave in a paraxial region thereof andan image-side surface 532 being convex in a paraxial region thereof. Thethird lens element 530 is made of plastic material and has theobject-side surface 531 and the image-side surface 532 being bothaspheric.

The fourth lens element 540 with positive refractive power has anobject-side surface 541 being convex in a paraxial region thereof and animage-side surface 542 being convex in a paraxial region thereof. Thefourth lens element 540 is made of plastic material and has theobject-side surface 541 and the image-side surface 542 being bothaspheric.

The fifth lens element 550 with negative refractive power has anobject-side surface 551 being concave in a paraxial region thereof andan image-side surface 552 being concave in a paraxial region thereof.The fifth lens element 550 is made of plastic material and has theobject-side surface 551 and the image-side surface 552 being bothaspheric.

The sixth lens element 560 with positive refractive power has anobject-side surface 561 being concave in a paraxial region thereof andan image-side surface 562 being convex in a paraxial region thereof. Thesixth lens element 560 is made of plastic material and has theobject-side surface 561 and the image-side surface 562 being bothaspheric. The image-side surface 562 of the sixth lens element 560 hasat least one concave shape in an off-axis region thereof.

The IR-cut filter 570 is made of glass material and located between thesixth lens element 560 and the image surface 580, and will not affectthe focal length of the imaging optical lens system. The image sensor590 is disposed on or near the image surface 580 of the imaging opticallens system.

The detailed optical data of the 5th embodiment are shown in Table 9 andthe aspheric surface data are shown in Table 10 below.

TABLE 9 5th Embodiment f = 1.00 mm, Fno = 2.00, HFOV = 88.0 deg. FocalSurface # Curvature Radius Thickness Material Index Abbe # Length 0Object Plano Infinity 1 Lens 1 23.413 (ASP) 0.490 Plastic 1.535 55.8−3.82 2 1.864 (ASP) 2.604 3 Lens 2 −1.740 (ASP) 1.042 Plastic 1.583 30.210.16 4 −1.642 (ASP) 0.858 5 Ape. Stop Plano 0.050 6 Lens 3 −35.714(ASP) 0.481 Plastic 1.535 55.8 3.42 7 −1.748 (ASP) 0.273 8 Lens 4 3.811(ASP) 0.947 Plastic 1.535 55.8 1.31 9 −0.782 (ASP) 0.112 10 Lens 5−0.596 (ASP) 0.300 Plastic 1.639 23.5 −0.90 11 16.990 (ASP) 0.092 12Lens 6 −5.835 (ASP) 0.785 Plastic 1.544 56.0 1.82 13 −0.885 (ASP) 0.19314 IR-cut filter Plano 0.300 Glass 1.517 64.2 — 15 Plano 0.565 16 ImagePlano — Note: Reference wavelength is 587.6 nm (d-line).

TABLE 10 Aspheric Coefficients Surface # 1 2 3 4 6 7 k = 6.2260E+00−5.7715E−01 −5.9869E−01 −1.4318E+00 −9.0000E+01 −5.9625E+00 A4 =−8.3511E−05 −5.9453E−03 3.5021E−02 8.2056E−02 1.7484E−01 5.6856E−02 A6 =1.0643E−05 3.6327E−03 1.6574E−03 −3.7714E−02 −7.1407E−01 −8.3596E−01 A8= — — −8.8199E−04 2.4386E−02 1.9098E+00 1.4529E+00 A10 = — — −1.0630E−04−7.8020E−03 −4.6321E+00 −2.5139E+00 A12 = — — — — 3.1105E+00 1.7176E+00A14 = — — — — −1.5688E−17 −1.5820E−17 Surface # 8 9 10 11 12 13 k =−2.9203E+00 −2.5072E+00 −1.5352E+00 −9.0000E+01 2.0000E+01 −1.0103E+00A4 = 1.2843E−01 3.2226E−01 4.2821E−01 −2.0255E−01 1.5808E−01 3.8677E−01A6 = −6.3376E−01 −8.1088E−01 −6.2892E−01 6.0369E−01 8.1276E−029.0747E−02 A8 = 4.7883E−01 −8.3244E−02 2.7348E−01 −5.2127E−01−1.0155E−01 −2.5841E−01 A10 = −5.3467E−01 8.6554E−01 4.7370E−031.7622E−01 4.0548E−02 1.7929E−01 A12 = −2.2077E−16 −4.9276E−01 —−1.9459E−02 −5.3096E−03 −5.6933E−02 A14 = — −1.6207E−17 — — −1.1216E−046.1534E−03

In the 5th embodiment, the equation of the aspheric surface profiles ofthe aforementioned lens elements is the same as the equation of the 1stembodiment. Also, the definitions of these parameters shown in thefollowing table are the same as those stated in the 1st embodiment withcorresponding values for the 5th embodiment, so an explanation in thisregard will not be provided again.

Moreover, these parameters can be calculated from Table 9 and Table 10as the following values and satisfy the following conditions:

5th Embodiment f [mm] 1.00 (CT2/R3) + (CT2/R4) −1.23 Fno 2.00 (R9 +R10)/(R9 − R10) −0.93 HFOV [deg.] 88.0 (R11 + R12)/(R11 − R12) 1.36|1/tan(HFOV)| 0.03 f/T12 0.39 T56/T45 0.82 f3/f2 0.34 CT2/CT3 2.17 SL/TL0.45 CT6/CT5 2.62 |Y62/Y11| 0.33

6th Embodiment

FIG. 11 is a schematic view of an image capturing unit according to the6th embodiment of the present disclosure. FIG. 12 shows, in order fromleft to right, spherical aberration curves, astigmatic field curves anda distortion curve of the image capturing unit according to the 6thembodiment. In FIG. 11, the image capturing unit includes the imagingoptical lens system (its reference numeral is omitted) of the presentdisclosure and an image sensor 690. The imaging optical lens systemincludes, in order from an object side to an image side, a first lenselement 610, a second lens element 620, an aperture stop 600, a thirdlens element 630, a fourth lens element 640, a fifth lens element 650, asixth lens element 660, an IR-cut filter 670 and an image surface 680,wherein the imaging optical lens system has a total of six lens elements(610-660).

The first lens element 610 with negative refractive power has anobject-side surface 611 being convex in a paraxial region thereof and animage-side surface 612 being concave in a paraxial region thereof. Thefirst lens element 610 is made of plastic material and has theobject-side surface 611 and the image-side surface 612 being bothaspheric.

The second lens element 620 with negative refractive power has anobject-side surface 621 being concave in a paraxial region thereof andan image-side surface 622 being convex in a paraxial region thereof. Thesecond lens element 620 is made of plastic material and has theobject-side surface 621 and the image-side surface 622 being bothaspheric.

The third lens element 630 with positive refractive power has anobject-side surface 631 being convex in a paraxial region thereof and animage-side surface 632 being convex in a paraxial region thereof. Thethird lens element 630 is made of plastic material and has theobject-side surface 631 and the image-side surface 632 being bothaspheric.

The fourth lens element 640 with positive refractive power has anobject-side surface 641 being convex in a paraxial region thereof and animage-side surface 642 being convex in a paraxial region thereof. Thefourth lens element 640 is made of plastic material and has theobject-side surface 641 and the image-side surface 642 being bothaspheric.

The fifth lens element 650 with negative refractive power has anobject-side surface 651 being concave in a paraxial region thereof andan image-side surface 652 being concave in a paraxial region thereof.The fifth lens element 650 is made of plastic material and has theobject-side surface 651 and the image-side surface 652 being bothaspheric.

The sixth lens element 660 with positive refractive power has anobject-side surface 661 being concave in a paraxial region thereof andan image-side surface 662 being convex in a paraxial region thereof. Thesixth lens element 660 is made of plastic material and has theobject-side surface 661 and the image-side surface 662 being bothaspheric. The image-side surface 662 of the sixth lens element 660 hasat least one concave shape in an off-axis region thereof.

The IR-cut filter 670 is made of glass material and located between thesixth lens element 660 and the image surface 680, and will not affectthe focal length of the imaging optical lens system. The image sensor690 is disposed on or near the image surface 680 of the imaging opticallens system.

The detailed optical data of the 6th embodiment are shown in Table 11and the aspheric surface data are shown in Table 12 below.

TABLE 11 6th Embodiment f = 1.81 mm, Fno = 2.15, HFOV = 78.0 deg. FocalSurface # Curvature Radius Thickness Material Index Abbe # Length 0Object Plano Infinity 1 Lens 1 33.952 (ASP) 0.350 Plastic 1.544 56.0−6.58 2 3.229 (ASP) 3.287 3 Lens 2 −3.038 (ASP) 1.500 Plastic 1.634 23.8−38.5 4 −4.134 (ASP) 1.896 5 Ape. Stop Plano 0.050 6 Lens 3 4.299 (ASP)0.605 Plastic 1.544 56.0 3.71 7 −3.618 (ASP) 1.373 8 Lens 4 392.901(ASP) 0.993 Plastic 1.544 56.0 3.01 9 −1.644 (ASP) 0.186 10 Lens 5−1.286 (ASP) 0.837 Plastic 1.660 20.4 −1.73 11 12.751 (ASP) 0.133 12Lens 6 −4.413 (ASP) 0.858 Plastic 1.544 56.0 2.56 13 −1.131 (ASP) 0.50014 IR-cut filter Plano 0.540 Glass 1.517 64.2 — 15 Plano 0.746 16 ImagePlano — Note: Reference wavelength is 587.6 nm (d-line).

TABLE 12 Aspheric Coefficients Surface # 1 2 3 4 6 7 k = −1.0594E+01−8.1776E−01 −6.3813E−01 −9.3035E−01 −2.2893E+00 −1.4234E+00 A4 =−4.1404E−05 −2.2098E−03 6.4747E−03 1.2888E−02 2.1193E−02 1.8223E−02 A6 =2.1123E−07 4.5122E−04 4.7706E−05 −1.2155E−03 −1.3945E−02 −4.3437E−03 A8= — — −2.7063E−05 5.4045E−04 2.6686E−02 1.0781E−02 A10 = — — 8.4284E−07−6.1461E−05 −1.6450E−02 −5.4073E−03 A12 = — — — — 4.8398E−03 2.6725E−03A14 = — — — — 5.9130E−15 5.0034E−15 Surface # 8 9 10 11 12 13 k =−9.0000E+01 −5.3763E+00 −1.1887E+00 −9.0000E+01 −8.5141E+00 −9.3066E−01A4 = 2.1335E−02 1.4672E−02 5.3620E−02 −5.1033E−02 3.3879E−02 9.4745E−02A6 = −1.8008E−02 −4.2477E−02 −4.3161E−02 2.4670E−02 1.3532E−031.7641E−02 A8 = 5.3825E−03 −2.0684E−03 5.2814E−03 −7.8981E−03−1.5754E−03 −7.0295E−03 A10 = −1.7687E−03 5.5060E−03 1.6683E−031.0986E−03 2.2190E−04 1.0101E−03 A12 = 1.4429E−13 −7.6672E−04 —−3.0278E−05 −8.2616E−06 −8.8587E−05 A14 = — 8.2069E−16 — — −5.3866E−082.9551E−06 A16 = — — — — — 1.9601E−19

In the 6th embodiment, the equation of the aspheric surface profiles ofthe aforementioned lens elements is the same as the equation of the 1stembodiment. Also, the definitions of these parameters shown in thefollowing table are the same as those stated in the 1st embodiment withcorresponding values for the 6th embodiment, so an explanation in thisregard will not be provided again.

Moreover, these parameters can be calculated from Table 11 and Table 12as the following values and satisfy the following conditions:

6th Embodiment f [mm] 1.81 (CT2/R3) + (CT2/R4) −0.86 Fno 2.15 (R9 +R10)/(R9 − R10) −0.82 HFOV [deg.] 78.0 (R11 + R12)/(R11 − R12) 1.69|1/tan(HFOV)| 0.21 f/T12 0.55 T56/T45 0.72 f3/f2 −0.10 CT2/CT3 2.48SL/TL 0.49 CT6/CT5 1.03 |Y62/Y11| 0.44

7th Embodiment

FIG. 13 is a schematic view of an image capturing unit according to the7th embodiment of the present disclosure. FIG. 14 shows, in order fromleft to right, spherical aberration curves, astigmatic field curves anda distortion curve of the image capturing unit according to the 7thembodiment. In FIG. 13, the image capturing unit includes the imagingoptical lens system (its reference numeral is omitted) of the presentdisclosure and an image sensor 790. The imaging optical lens systemincludes, in order from an object side to an image side, a first lenselement 710, a second lens element 720, an aperture stop 700, a thirdlens element 730, a fourth lens element 740, a fifth lens element 750, asixth lens element 760, an IR-cut filter 770 and an image surface 780,wherein the imaging optical lens system has a total of six lens elements(710-760).

The first lens element 710 with negative refractive power has anobject-side surface 711 being concave in a paraxial region thereof andan image-side surface 712 being concave in a paraxial region thereof.The first lens element 710 is made of plastic material and has theobject-side surface 711 and the image-side surface 712 being bothaspheric.

The second lens element 720 with negative refractive power has anobject-side surface 721 being concave in a paraxial region thereof andan image-side surface 722 being convex in a paraxial region thereof. Thesecond lens element 720 is made of glass material and has theobject-side surface 721 and the image-side surface 722 being bothaspheric.

The third lens element 730 with positive refractive power has anobject-side surface 731 being convex in a paraxial region thereof and animage-side surface 732 being convex in a paraxial region thereof. Thethird lens element 730 is made of plastic material and has theobject-side surface 731 and the image-side surface 732 being bothaspheric.

The fourth lens element 740 with positive refractive power has anobject-side surface 741 being convex in a paraxial region thereof and animage-side surface 742 being convex in a paraxial region thereof. Thefourth lens element 740 is made of plastic material and has theobject-side surface 741 and the image-side surface 742 being bothaspheric.

The fifth lens element 750 with negative refractive power has anobject-side surface 751 being concave in a paraxial region thereof andan image-side surface 752 being convex in a paraxial region thereof. Thefifth lens element 750 is made of plastic material and has theobject-side surface 751 and the image-side surface 752 being bothaspheric.

The sixth lens element 760 with positive refractive power has anobject-side surface 761 being concave in a paraxial region thereof andan image-side surface 762 being convex in a paraxial region thereof. Thesixth lens element 760 is made of plastic material and has theobject-side surface 761 and the image-side surface 762 being bothaspheric. The image-side surface 762 of the sixth lens element 760 hasat least one concave shape in an off-axis region thereof.

The IR-cut filter 770 is made of glass material and located between thesixth lens element 760 and the image surface 780, and will not affectthe focal length of the imaging optical lens system. The image sensor790 is disposed on or near the image surface 780 of the imaging opticallens system.

The detailed optical data of the 7th embodiment are shown in Table 13and the aspheric surface data are shown in Table 14 below.

TABLE 13 7th Embodiment f = 1.83 mm, Fno = 2.15, HFOV = 78.0 deg. FocalSurface # Curvature Radius Thickness Material Index Abbe # Length 0Object Plano Infinity 1 Lens 1 −56.519 (ASP) 0.789 Plastic 1.515 56.5−7.62 2 4.234 (ASP) 3.273 3 Lens 2 −3.058 (ASP) 1.488 Glass 1.652 58.5−264.52 4 −3.711 (ASP) 2.043 5 Ape. Stop Plano 0.050 6 Lens 3 4.276(ASP) 0.546 Plastic 1.544 56.0 4.17 7 −4.604 (ASP) 0.927 8 Lens 4 20.674(ASP) 1.110 Plastic 1.515 56.5 2.98 9 −1.629 (ASP) 0.357 10 Lens 5−0.908 (ASP) 0.796 Plastic 1.660 20.4 −1.78 11 −5.386 (ASP) 0.057 12Lens 6 −6.041 (ASP) 0.662 Plastic 1.544 56.0 2.66 13 −1.213 (ASP) 0.50014 IR-cut filter Plano 0.300 Glass 1.517 64.2 — 15 Plano 1.012 16 ImagePlano — Note: Reference wavelength is 587.6 nm (d-line).

TABLE 14 Aspheric Coefficients Surface # 1 2 3 4 6 7 k = −8.3839E+01−1.4087E+00 −8.2419E−01 −1.8988E+00 2.8929E+00 −8.5404E+00 A4 =6.2873E−05 −2.4658E−03 7.6847E−03 1.4284E−02 4.3250E−02 4.9997E−02 A6 =2.2963E−06 1.1594E−04 1.2044E−04 −1.7168E−03 −1.1890E−02 2.5404E−03 A8 =— — −4.3115E−05 4.6363E−04 3.7641E−02 1.0369E−02 A10 = — — −6.9055E−06−7.7148E−05 −1.8894E−02 4.1310E−03 A12 = — — — — 4.8398E−03 2.6725E−03A14 = — — — — 5.9713E−15 4.9404E−15 Surface # 8 9 10 11 12 13 k =2.0000E+01 −3.3340E+00 −1.5093E+00 −9.0000E+01 4.5673E+00 −9.1671E−01 A4= 4.5214E−02 3.5922E−02 6.4838E−02 −5.3418E−02 −3.9904E−03 6.7383E−02 A6= −2.5373E−02 −4.6531E−02 −4.9095E−02 2.4354E−02 9.0520E−03 2.2236E−02A8 = 5.9285E−03 −2.6702E−03 2.0687E−03 −7.7140E−03 −6.3793E−04−6.9588E−03 A10 = −1.5583E−03 5.5350E−03 2.8273E−03 1.0719E−036.6118E−05 1.0348E−03 A12 = 1.4995E−13 −7.6672E−04 — −3.0278E−05−8.2616E−06 −8.8587E−05 A14 = — 6.6843E−16 — — −5.3866E−08 2.9551E−06A16 = — — — — — 1.9465E−19

In the 7th embodiment, the equation of the aspheric surface profiles ofthe aforementioned lens elements is the same as the equation of the 1stembodiment. Also, the definitions of these parameters shown in thefollowing table are the same as those stated in the 1st embodiment withcorresponding values for the 7th embodiment, so an explanation in thisregard will not be provided again.

Moreover, these parameters can be calculated from Table 13 and Table 14as the following values and satisfy the following conditions:

7th Embodiment f [mm] 1.83 (CT2/R3) + (CT2/R4) −0.89 Fno 2.15 (R9 +R10)/(R9 − R10) −1.41 HFOV [deg.] 78.0 (R11 + R12)/(R11 − R12) 1.50|1/tan(HFOV)| 0.21 f/T12 0.56 T56/T45 0.16 f3/f2 −0.02 CT2/CT3 2.73SL/TL 0.45 CT6/CT5 0.83 |Y62/Y11| 0.36

8th Embodiment

FIG. 15 is a schematic view of an image capturing unit according to the8th embodiment of the present disclosure. FIG. 16 shows, in order fromleft to right, spherical aberration curves, astigmatic field curves anda distortion curve of the image capturing unit according to the 8thembodiment. In FIG. 15, the image capturing unit includes the imagingoptical lens system (its reference numeral is omitted) of the presentdisclosure and an image sensor 890. The imaging optical lens systemincludes, in order from an object side to an image side, a first lenselement 810, a second lens element 820, an aperture stop 800, a thirdlens element 830, a fourth lens element 840, a fifth lens element 850, asixth lens element 860, an IR-cut filter 870 and an image surface 880,wherein the imaging optical lens system has a total of six lens elements(810-860).

The first lens element 810 with negative refractive power has anobject-side surface 811 being convex in a paraxial region thereof and animage-side surface 812 being concave in a paraxial region thereof. Thefirst lens element 810 is made of plastic material and has theobject-side surface 811 and the image-side surface 812 being bothaspheric.

The second lens element 820 with negative refractive power has anobject-side surface 821 being concave in a paraxial region thereof andan image-side surface 822 being convex in a paraxial region thereof. Thesecond lens element 820 is made of plastic material and has theobject-side surface 821 and the image-side surface 822 being bothaspheric.

The third lens element 830 with positive refractive power has anobject-side surface 831 being convex in a paraxial region thereof and animage-side surface 832 being convex in a paraxial region thereof. Thethird lens element 830 is made of plastic material and has theobject-side surface 831 and the image-side surface 832 being bothaspheric.

The fourth lens element 840 with positive refractive power has anobject-side surface 841 being concave in a paraxial region thereof andan image-side surface 842 being convex in a paraxial region thereof. Thefourth lens element 840 is made of plastic material and has theobject-side surface 841 and the image-side surface 842 being bothaspheric.

The fifth lens element 850 with negative refractive power has anobject-side surface 851 being concave in a paraxial region thereof andan image-side surface 852 being convex in a paraxial region thereof. Thefifth lens element 850 is made of plastic material and has theobject-side surface 851 and the image-side surface 852 being bothaspheric.

The sixth lens element 860 with positive refractive power has anobject-side surface 861 being concave in a paraxial region thereof andan image-side surface 862 being convex in a paraxial region thereof. Thesixth lens element 860 is made of plastic material and has theobject-side surface 861 and the image-side surface 862 being bothaspheric. The image-side surface 862 of the sixth lens element 860 hasat least one concave shape in an off-axis region thereof.

The IR-cut filter 870 is made of glass material and located between thesixth lens element 860 and the image surface 880, and will not affectthe focal length of the imaging optical lens system. The image sensor890 is disposed on or near the image surface 880 of the imaging opticallens system.

The detailed optical data of the 8th embodiment are shown in Table 15and the aspheric surface data are shown in Table 16 below.

TABLE 15 8th Embodiment f = 1.15 mm, Fno = 2.25, HFOV = 94.0 deg. FocalSurface # Curvature Radius Thickness Material Index Abbe # Length 0Object Plano Infinity 1 Lens 1 5.479 (ASP) 1.459 Plastic 1.535 55.8−6.28 2 1.889 (ASP) 2.383 3 Lens 2 −1.683 (ASP) 1.030 Plastic 1.544 56.0−26.94 4 −2.312 (ASP) 0.613 5 Ape. Stop Plano 0.143 6 Lens 3 2.363 (ASP)0.629 Plastic 1.535 55.8 1.77 7 −1.434 (ASP) 0.223 8 Lens 4 −2.023 (ASP)0.819 Plastic 1.535 55.8 1.61 9 −0.689 (ASP) 0.171 10 Lens 5 −0.531(ASP) 0.300 Plastic 1.650 21.5 −1.07 11 −2.701 (ASP) 0.092 12 Lens 6−2.874 (ASP) 1.105 Plastic 1.544 55.9 1.38 13 −0.677 (ASP) 0.038 14IR-cut filter Plano 0.300 Glass 1.517 64.2 — 15 Plano 0.633 16 ImagePlano — Note: Reference wavelength is 587.6 nm (d-line).

TABLE 16 Aspheric Coefficients Surface # 1 2 3 4 6 7 k = −1.9978E+00−2.1125E−01 −9.9027E−01 −1.9875E+00 −1.9902E+01 −4.4815E+00 A4 =1.7782E−03 −3.0299E−02 6.2650E−02 1.0171E−01 2.5130E−01 6.5987E−02 A6 =−3.4955E−04 1.3876E−02 −1.2813E−02 −4.4401E−02 −5.5700E−01 −6.8587E−01A8 = 1.8571E−05 −4.1247E−03 1.4674E−03 2.8656E−02 1.4669E+00 1.4733E+00A10 = −3.2944E−07 4.4219E−04 2.3509E−04 6.3671E−03 −3.7204E+00−2.8585E+00 A12 = — — — — 3.1105E+00 1.7176E+00 Surface # 8 9 10 11 1213 k = −5.5971E+00 −1.6813E+00 −1.1812E+00 −7.0588E−01 1.1425E+00−1.8600E+00 A4 = 1.6919E−01 4.3388E−01 5.0906E−01 −1.8408E−01 1.4170E−011.7836E−01 A6 = −5.8775E−01 −5.5790E−01 −5.5101E−01 5.3474E−011.1366E−01 4.3950E−02 A8 = 7.4011E−02 −2.4696E−01 5.3649E−01 −3.2268E−01−1.2043E−01 −1.6082E−01 A10 = −1.7289E−01 8.5868E−01 −2.9338E−014.2221E−02 4.4793E−02 1.2146E−01 A12 = — −4.9276E−01 — 1.1245E−02−5.6224E−03 −3.6309E−02 A14 = — — — — −1.9545E−04 3.6504E−03

In the 8th embodiment, the equation of the aspheric surface profiles ofthe aforementioned lens elements is the same as the equation of the 1stembodiment. Also, the definitions of these parameters shown in thefollowing table are the same as those stated in the 1st embodiment withcorresponding values for the 8th embodiment, so an explanation in thisregard will not be provided again.

Moreover, these parameters can be calculated from Table 15 and Table 16as the following values and satisfy the following conditions:

8th Embodiment f [mm] 1.15 (CT2/R3) + (CT2/R4) −1.06 Fno 2.25 (R9 +R10)/(R9 − R10) −1.49 HFOV [deg.] 94.0 (R11 + R12)/(R11 − R12) 1.62|1/tan(HFOV)| 0.07 f/T12 0.48 T56/T45 0.54 f3/f2 −0.07 CT2/CT3 1.64SL/TL 0.45 CT6/CT5 3.68 |Y62/Y11| 0.33

9th Embodiment

FIG. 17 is a schematic view of an image capturing unit according to the9th embodiment of the present disclosure. FIG. 18 shows, in order fromleft to right, spherical aberration curves, astigmatic field curves anda distortion curve of the image capturing unit according to the 9thembodiment. In FIG. 17, the image capturing unit includes the imagingoptical lens system (its reference numeral is omitted) of the presentdisclosure and an image sensor 990. The imaging optical lens systemincludes, in order from an object side to an image side, a first lenselement 910, a second lens element 920, a third lens element 930, anaperture stop 900, a fourth lens element 940, a fifth lens element 950,a sixth lens element 960, an IR-cut filter 970 and an image surface 980,wherein the imaging optical lens system has a total of six lens elements(910-960).

The first lens element 910 with negative refractive power has anobject-side surface 911 being concave in a paraxial region thereof andan image-side surface 912 being concave in a paraxial region thereof.The first lens element 910 is made of plastic material and has theobject-side surface 911 and the image-side surface 912 being bothaspheric.

The second lens element 920 with positive refractive power has anobject-side surface 921 being concave in a paraxial region thereof andan image-side surface 922 being convex in a paraxial region thereof. Thesecond lens element 920 is made of plastic material and has theobject-side surface 921 and the image-side surface 922 being bothaspheric.

The third lens element 930 with positive refractive power has anobject-side surface 931 being convex in a paraxial region thereof and animage-side surface 932 being convex in a paraxial region thereof. Thethird lens element 930 is made of plastic material and has theobject-side surface 931 and the image-side surface 932 being bothaspheric.

The fourth lens element 940 with positive refractive power has anobject-side surface 941 being concave in a paraxial region thereof andan image-side surface 942 being convex in a paraxial region thereof. Thefourth lens element 940 is made of plastic material and has theobject-side surface 941 and the image-side surface 942 being bothaspheric.

The fifth lens element 950 with negative refractive power has anobject-side surface 951 being concave in a paraxial region thereof andan image-side surface 952 being concave in a paraxial region thereof.The fifth lens element 950 is made of plastic material and has theobject-side surface 951 and the image-side surface 952 being bothaspheric.

The sixth lens element 960 with positive refractive power has anobject-side surface 961 being concave in a paraxial region thereof andan image-side surface 962 being convex in a paraxial region thereof. Thesixth lens element 960 is made of plastic material and has theobject-side surface 961 and the image-side surface 962 being bothaspheric. The image-side surface 962 of the sixth lens element 960 hasat least one concave shape in an off-axis region thereof.

The IR-cut filter 970 is made of glass material and located between thesixth lens element 960 and the image surface 980, and will not affectthe focal length of the imaging optical lens system. The image sensor990 is disposed on or near the image surface 980 of the imaging opticallens system.

The detailed optical data of the 9th embodiment are shown in Table 17and the aspheric surface data are shown in Table 18 below.

TABLE 17 9th Embodiment f = 1.26 mm, Fno = 2.05, HFOV = 80.0 deg. FocalSurface # Curvature Radius Thickness Material Index Abbe # Length 0Object Plano Infinity 1 Lens 1 −16.949 (ASP) 0.997 Plastic 1.515 56.5−2.35 2 1.330 (ASP) 1.831 3 Lens 2 −2.599 (ASP) 0.817 Plastic 1.650 21.534.07 4 −2.614 (ASP) 0.908 5 Lens 3 2.541 (ASP) 0.633 Plastic 1.544 55.92.11 6 −1.914 (ASP) −0.167 7 Ape. Stop Plano 0.608 8 Lens 4 −3.149 (ASP)0.654 Plastic 1.544 55.9 2.23 9 −0.940 (ASP) 0.057 10 Lens 5 −1.611(ASP) 0.452 Plastic 1.660 20.4 −1.42 11 2.493 (ASP) 0.136 12 Lens 6−8.583 (ASP) 0.784 Plastic 1.544 55.9 3.83 13 −1.730 (ASP) 0.700 14IR-cut filter Plano 0.300 Glass 1.517 64.2 — 15 Plano 0.594 16 ImagePlano — Note: Reference wavelength is 587.6 nm (d-line).

TABLE 18 Aspheric Coefficients Surface # 1 2 3 4 5 6 k = −9.0000E+01−5.1301E−01 7.7116E−01 2.4334E+00 −2.0085E+01 −1.1771E+01 A4 =3.2160E−03 −4.4469E−02 −4.5947E−02 2.8746E−02 1.3128E−01 −1.3541E−01 A6= −3.8705E−04 1.7093E−02 2.6968E−02 1.8152E−02 −2.7472E−02 1.6292E−01 A8= 2.5306E−05 −8.3735E−03 8.8333E−03 1.3135E−02 −3.3557E−01 −2.2729E−01A10 = −6.2921E−07 1.1275E−03 −6.8889E−03 −5.8476E−03 5.8671E−011.3818E−01 A12 = — — 8.9159E−04 1.5844E−03 −3.8331E−01 −6.5929E−02Surface # 8 9 10 11 12 13 k = −3.3055E+01 −1.3269E+00 −2.7715E−02−4.1446E+01 3.3974E+01 −5.1633E−01 A4 = −1.0245E−02 8.4733E−014.4928E−01 1.3835E−01 3.3432E−01 2.0671E−01 A6 = 2.9766E−01 −1.7688E+00−1.2952E+00 −3.0256E−01 −2.9650E−01 −7.3542E−02 A8 = −1.0634E+001.6301E+00 1.2645E+00 2.9131E−01 1.1357E−01 5.3116E−02 A10 = 1.3928E+00−6.9056E−01 −5.2058E−01 −1.4631E−01 1.6754E−02 −5.2807E−02 A12 =−6.8491E−01 5.3425E−02 −5.8094E−03 2.7529E−02 −2.7245E−02 2.7100E−02 A14= — — — — 6.1869E−03 −4.8275E−03

In the 9th embodiment, the equation of the aspheric surface profiles ofthe aforementioned lens elements is the same as the equation of the 1stembodiment. Also, the definitions of these parameters shown in thefollowing table are the same as those stated in the 1st embodiment withcorresponding values for the 9th embodiment, so an explanation in thisregard will not be provided again.

Moreover, these parameters can be calculated from Table 17 and Table 18as the following values and satisfy the following conditions:

9th Embodiment f [mm] 1.26 (CT2/R3) + (CT2/R4) −0.63 Fno 2.05 (R9 +R10)/(R9 − R10) −0.21 HFOV [deg.] 80.0 (R11 + R12)/(R11 − R12) 1.50|1/tan(HFOV)| 0.18 f/T12 0.69 T56/T45 2.39 f3/f2 0.06 CT2/CT3 1.29 SL/TL0.46 CT6/CT5 1.73 |Y62/Y11| 0.39

10th Embodiment

FIG. 19 is a schematic view of an image capturing unit according to the10th embodiment of the present disclosure. FIG. 20 shows, in order fromleft to right, spherical aberration curves, astigmatic field curves anda distortion curve of the image capturing unit according to the 10thembodiment. In FIG. 19, the image capturing unit includes the imagingoptical lens system (its reference numeral is omitted) of the presentdisclosure and an image sensor 1090. The imaging optical lens systemincludes, in order from an object side to an image side, a first lenselement 1010, a second lens element 1020, a third lens element 1030, anaperture stop 1000, a fourth lens element 1040, a fifth lens element1050, a sixth lens element 1060, an IR-cut filter 1070 and an imagesurface 1080, wherein the imaging optical lens system has a total of sixlens elements (1010-1060).

The first lens element 1010 with negative refractive power has anobject-side surface 1011 being concave in a paraxial region thereof andan image-side surface 1012 being concave in a paraxial region thereof.The first lens element 1010 is made of plastic material and has theobject-side surface 1011 and the image-side surface 1012 being bothaspheric.

The second lens element 1020 with positive refractive power has anobject-side surface 1021 being concave in a paraxial region thereof andan image-side surface 1022 being convex in a paraxial region thereof.The second lens element 1020 is made of plastic material and has theobject-side surface 1021 and the image-side surface 1022 being bothaspheric.

The third lens element 1030 with positive refractive power has anobject-side surface 1031 being convex in a paraxial region thereof andan image-side surface 1032 being convex in a paraxial region thereof.The third lens element 1030 is made of plastic material and has theobject-side surface 1031 and the image-side surface 1032 being bothaspheric.

The fourth lens element 1040 with positive refractive power has anobject-side surface 1041 being concave in a paraxial region thereof andan image-side surface 1042 being convex in a paraxial region thereof.The fourth lens element 1040 is made of plastic material and has theobject-side surface 1041 and the image-side surface 1042 being bothaspheric.

The fifth lens element 1050 with negative refractive power has anobject-side surface 1051 being concave in a paraxial region thereof andan image-side surface 1052 being concave in a paraxial region thereof.The fifth lens element 1050 is made of plastic material and has theobject-side surface 1051 and the image-side surface 1052 being bothaspheric.

The sixth lens element 1060 with positive refractive power has anobject-side surface 1061 being concave in a paraxial region thereof andan image-side surface 1062 being convex in a paraxial region thereof.The sixth lens element 1060 is made of plastic material and has theobject-side surface 1061 and the image-side surface 1062 being bothaspheric. The image-side surface 1062 of the sixth lens element 1060 hasat least one concave shape in an off-axis region thereof.

The IR-cut filter 1070 is made of glass material and located between thesixth lens element 1060 and the image surface 1080, and will not affectthe focal length of the imaging optical lens system. The image sensor1090 is disposed on or near the image surface 1080 of the imagingoptical lens system.

The detailed optical data of the 10th embodiment are shown in Table 19and the aspheric surface data are shown in Table 20 below.

TABLE 19 10th Embodiment f = 1.25 mm, Fno = 1.84, HFOV = 86.0 deg. FocalSurface # Curvature Radius Thickness Material Index Abbe # Length 0Object Plano Infinity 1 Lens 1 −33.887 (ASP) 0.300 Plastic 1.515 56.5−2.44 2 1.309 (ASP) 1.251 3 Lens 2 −2.570 (ASP) 1.035 Plastic 1.650 21.544.92 4 −2.737 (ASP) 1.094 5 Lens 3 2.314 (ASP) 0.630 Plastic 1.544 55.92.14 6 −2.122 (ASP) −0.180 7 Ape. Stop Plano 0.512 8 Lens 4 −8.211 (ASP)0.634 Plastic 1.544 55.9 2.31 9 −1.118 (ASP) 0.068 10 Lens 5 −1.591(ASP) 0.300 Plastic 1.660 20.4 −1.47 11 2.690 (ASP) 0.080 12 Lens 6−7.121 (ASP) 0.655 Plastic 1.515 56.5 3.75 13 −1.564 (ASP) 0.700 14IR-cut filter Plano 0.300 Glass 1.517 64.2 — 15 Plano 0.665 16 ImagePlano — Note: Reference wavelength is 587.6 nm (d-line).

TABLE 20 Aspheric Coefficients Surface # 1 2 3 4 5 6 k = −6.7562E+01−8.0512E−01 9.1837E−01 2.0001E+00 −1.6880E+01 −1.1020E+01 A4 =3.2461E−03 −5.5118E−02 −7.5963E−02 3.7486E−03 9.6040E−02 −1.4120E−01 A6= −4.1018E−04 2.2188E−02 5.9188E−02 2.4863E−02 −2.9999E−02 1.6389E−01 A8= 3.4957E−05 −1.2893E−02 −4.5652E−03 8.2182E−03 −3.3028E−01 −2.3382E−01A10 = −1.0305E−06 4.1339E−03 −4.5519E−03 −7.5495E−03 5.8213E−011.4269E−01 A12 = — — 8.9159E−04 1.6933E−03 −3.8331E−01 −6.5929E−02Surface # 8 9 10 11 12 13 k = 3.0041E+01 −9.5947E−01 −4.8558E−01−4.2864E+01 3.3765E+01 −3.6373E+00 A4 = 2.3778E−02 8.1054E−01 5.0547E−01−1.3969E−03 1.8013E−01 1.6660E−01 A6 = 3.2470E−01 −1.7740E+00−1.8106E+00 −5.8791E−02 4.9222E−01 1.0181E−01 A8 = −1.0637E+001.6378E+00 2.5153E+00 −4.6916E−02 −1.3926E+00 1.7620E−01 A10 =1.3391E+00 −6.7668E−01 −1.7253E+00 9.5415E−02 1.2014E+00 −5.7826E−01 A12= −6.8491E−01 5.3425E−02 4.7107E−01 −3.8962E−02 −3.7720E−01 4.4334E−01A14 = — — — — 1.9647E−02 −1.0929E−01

In the 10th embodiment, the equation of the aspheric surface profiles ofthe aforementioned lens elements is the same as the equation of the 1stembodiment. Also, the definitions of these parameters shown in thefollowing table are the same as those stated in the 1st embodiment withcorresponding values for the 10th embodiment, so an explanation in thisregard will not be provided again.

Moreover, these parameters can be calculated from Table 19 and Table 20as the following values and satisfy the following conditions:

10th Embodiment f [mm] 1.25 (CT2/R3) + (CT2/R4) −0.78 Fno 1.84 (R9 +R10)/(R9 − R10) −0.26 HFOV [deg.] 86.0 (R11 + R12)/(R11 − R12) 1.56|1/tan(HFOV)| 0.07 f/T12 1.00 T56/T45 1.18 f3/f2 0.05 CT2/CT3 1.64 SL/TL0.49 CT6/CT5 2.18 |Y62/Y11| 0.48

11th Embodiment

FIG. 21 is a schematic view of an image capturing unit according to the11th embodiment of the present disclosure. FIG. 22 shows, in order fromleft to right, spherical aberration curves, astigmatic field curves anda distortion curve of the image capturing unit according to the 11thembodiment. In FIG. 21, the image capturing unit includes the imagingoptical lens system (its reference numeral is omitted) of the presentdisclosure and an image sensor 1190. The imaging optical lens systemincludes, in order from an object side to an image side, a first lenselement 1110, a second lens element 1120, a third lens element 1130, anaperture stop 1100, a fourth lens element 1140, a fifth lens element1150, a sixth lens element 1160, an IR-cut filter 1170 and an imagesurface 1180, wherein the imaging optical lens system has a total of sixlens elements (1110-1160).

The first lens element 1110 with negative refractive power has anobject-side surface 1111 being convex in a paraxial region thereof andan image-side surface 1112 being concave in a paraxial region thereof.The first lens element 1110 is made of plastic material and has theobject-side surface 1111 and the image-side surface 1112 being bothaspheric.

The second lens element 1120 with negative refractive power has anobject-side surface 1121 being concave in a paraxial region thereof andan image-side surface 1122 being convex in a paraxial region thereof.The second lens element 1120 is made of plastic material and has theobject-side surface 1121 and the image-side surface 1122 being bothaspheric.

The third lens element 1130 with positive refractive power has anobject-side surface 1131 being convex in a paraxial region thereof andan image-side surface 1132 being convex in a paraxial region thereof.The third lens element 1130 is made of plastic material and has theobject-side surface 1131 and the image-side surface 1132 being bothaspheric.

The fourth lens element 1140 with positive refractive power has anobject-side surface 1141 being concave in a paraxial region thereof andan image-side surface 1142 being convex in a paraxial region thereof.The fourth lens element 1140 is made of plastic material and has theobject-side surface 1141 and the image-side surface 1142 being bothaspheric.

The fifth lens element 1150 with negative refractive power has anobject-side surface 1151 being concave in a paraxial region thereof andan image-side surface 1152 being concave in a paraxial region thereof.The fifth lens element 1150 is made of plastic material and has theobject-side surface 1151 and the image-side surface 1152 being bothaspheric.

The sixth lens element 1160 with positive refractive power has anobject-side surface 1161 being convex in a paraxial region thereof andan image-side surface 1162 being convex in a paraxial region thereof.The sixth lens element 1160 is made of plastic material and has theobject-side surface 1161 and the image-side surface 1162 being bothaspheric. The image-side surface 1162 of the sixth lens element 1160 hasat least one concave shape in an off-axis region thereof.

The IR-cut filter 1170 is made of glass material and located between thesixth lens element 1160 and the image surface 1180, and will not affectthe focal length of the imaging optical lens system. The image sensor1190 is disposed on or near the image surface 1180 of the imagingoptical lens system.

The detailed optical data of the 11th embodiment are shown in Table 21and the aspheric surface data are shown in Table 22 below.

TABLE 21 11th Embodiment f = 1.25 mm, Fno = 1.98, HFOV = 89.0 deg. FocalSurface # Curvature Radius Thickness Material Index Abbe # Length 0Object Plano Infinity 1 Lens 1 8.300 (ASP) 0.800 Plastic 1.535 55.8−2.94 2 1.279 (ASP) 2.205 3 Lens 2 −2.503 (ASP) 1.456 Plastic 1.639 23.3−23.92 4 −3.672 (ASP) 0.475 5 Lens 3 1.861 (ASP) 0.618 Plastic 1.54455.9 2.31 6 −3.418 (ASP) −0.123 7 Ape. Stop Plano 0.677 8 Lens 4 −4.129(ASP) 0.665 Plastic 1.544 55.9 1.75 9 −0.817 (ASP) 0.062 10 Lens 5−1.265 (ASP) 0.526 Plastic 1.660 20.4 −1.30 11 3.128 (ASP) 0.050 12 Lens6 7.476 (ASP) 0.885 Plastic 1.544 55.9 4.27 13 −3.227 (ASP) 0.700 14IR-cut filter Plano 0.300 Glass 1.517 64.2 — 15 Plano 0.387 16 ImagePlano — Note: Reference wavelength is 587.6 nm (d-line).

TABLE 22 Aspheric Coefficients Surface # 1 2 3 4 5 6 k = −2.3954E+00−4.1202E−01 −3.4677E−01 6.2312E+00 −9.1867E+00 −6.2785E+01 A4 =2.8165E−03 6.4884E−03 −4.4579E−03 3.7513E−03 9.2979E−02 −1.5916E−01 A6 =−6.1054E−04 1.4619E−03 −1.0017E−02 2.8235E−04 −2.7234E−02 1.6068E−01 A8= 4.2208E−05 2.5215E−03 2.2353E−02 5.0608E−02 −2.8881E−01 −1.9548E−01A10 = −1.2393E−06 −1.0302E−03 −8.1112E−03 −3.4805E−02 5.4739E−011.0185E−01 A12 = — — 8.9159E−04 9.2632E−03 −3.8331E−01 −6.5929E−02Surface # 8 9 10 11 12 13 k = −9.0000E+01 −1.7714E+00 −4.5350E−01−7.0684E+01 −3.8485E+01 −5.1585E−01 A4 = 3.1280E−03 8.5492E−015.3625E−01 9.5546E−02 3.3434E−01 1.6687E−01 A6 = 2.9858E−01 −1.7621E+00−1.3097E+00 −1.0911E−01 −4.0973E−01 −1.2832E−01 A8 = −1.1022E+001.6576E+00 1.5328E+00 6.3375E−02 3.1421E−01 1.3211E−01 A10 = 1.3963E+00−6.8775E−01 −7.6877E−01 4.6055E−03 −1.4337E−01 −8.6719E−02 A12 =−6.8491E−01 5.3425E−02 1.2058E−01 −8.8703E−03 3.6917E−02 3.0722E−02 A14= — — — — −4.1764E−03 −4.3930E−03

In the 11th embodiment, the equation of the aspheric surface profiles ofthe aforementioned lens elements is the same as the equation of the 1stembodiment. Also, the definitions of these parameters shown in thefollowing table are the same as those stated in the 1st embodiment withcorresponding values for the 11th embodiment, so an explanation in thisregard will not be provided again.

Moreover, these parameters can be calculated from Table 21 and Table 22as the following values and satisfy the following conditions:

11th Embodiment f [mm] 1.25 (CT2/R3) + (CT2/R4) −0.98 Fno 1.98 (R9 +R10)/(R9 − R10) −0.42 HFOV [deg.] 89.0 (R11 + R12)/(R11 − R12) 0.40|1/tan(HFOV)| 0.02 f/T12 0.57 T56/T45 0.81 f3/f2 −0.10 CT2/CT3 2.36SL/TL 0.44 CT6/CT5 1.68 |Y62/Y11| 0.42

12th Embodiment

FIG. 23 is a schematic view of an image capturing unit according to the12th embodiment of the present disclosure. FIG. 24 shows, in order fromleft to right, spherical aberration curves, astigmatic field curves anda distortion curve of the image capturing unit according to the 12thembodiment. In FIG. 23, the image capturing unit includes the imagingoptical lens system (its reference numeral is omitted) of the presentdisclosure and an image sensor 1290. The imaging optical lens systemincludes, in order from an object side to an image side, a first lenselement 1210, a second lens element 1220, a third lens element 1230, anaperture stop 1200, a fourth lens element 1240, a fifth lens element1250, a sixth lens element 1260, an IR-cut filter 1270 and an imagesurface 1280, wherein the imaging optical lens system has a total of sixlens elements (1210-1260).

The first lens element 1210 with negative refractive power has anobject-side surface 1211 being convex in a paraxial region thereof andan image-side surface 1212 being concave in a paraxial region thereof.The first lens element 1210 is made of glass material and has theobject-side surface 1211 and the image-side surface 1212 being bothaspheric.

The second lens element 1220 with negative refractive power has anobject-side surface 1221 being concave in a paraxial region thereof andan image-side surface 1222 being convex in a paraxial region thereof.The second lens element 1220 is made of plastic material and has theobject-side surface 1221 and the image-side surface 1222 being bothaspheric.

The third lens element 1230 with positive refractive power has anobject-side surface 1231 being convex in a paraxial region thereof andan image-side surface 1232 being convex in a paraxial region thereof.The third lens element 1230 is made of plastic material and has theobject-side surface 1231 and the image-side surface 1232 being bothaspheric.

The fourth lens element 1240 with positive refractive power has anobject-side surface 1241 being concave in a paraxial region thereof andan image-side surface 1242 being convex in a paraxial region thereof.The fourth lens element 1240 is made of plastic material and has theobject-side surface 1241 and the image-side surface 1242 being bothaspheric.

The fifth lens element 1250 with negative refractive power has anobject-side surface 1251 being concave in a paraxial region thereof andan image-side surface 1252 being concave in a paraxial region thereof.The fifth lens element 1250 is made of plastic material and has theobject-side surface 1251 and the image-side surface 1252 being bothaspheric.

The sixth lens element 1260 with positive refractive power has anobject-side surface 1261 being concave in a paraxial region thereof andan image-side surface 1262 being convex in a paraxial region thereof.The sixth lens element 1260 is made of plastic material and has theobject-side surface 1261 and the image-side surface 1262 being bothaspheric. The image-side surface 1262 of the sixth lens element 1260 hasat least one concave shape in an off-axis region thereof.

The IR-cut filter 1270 is made of glass material and located between thesixth lens element 1260 and the image surface 1280, and will not affectthe focal length of the imaging optical lens system. The image sensor1290 is disposed on or near the image surface 1280 of the imagingoptical lens system.

The detailed optical data of the 12th embodiment are shown in Table 23and the aspheric surface data are shown in Table 24 below.

TABLE 23 12th Embodiment f = 1.25 mm, Fno = 2.10, HFOV = 95.0 deg. FocalSurface # Curvature Radius Thickness Material Index Abbe # Length 0Object Plano Infinity 1 Lens 1 9.003 (ASP) 0.704 Glass 1.589 61.3 −2.742 1.330 (ASP) 2.135 3 Lens 2 −2.457 (ASP) 1.393 Plastic 1.639 23.3−26.13 4 −3.518 (ASP) 0.566 5 Lens 3 2.168 (ASP) 0.603 Plastic 1.54455.9 2.29 6 −2.640 (ASP) −0.137 7 Ape. Stop Plano 0.711 8 Lens 4 −3.812(ASP) 0.698 Plastic 1.544 55.9 1.88 9 −0.857 (ASP) 0.075 10 Lens 5−1.237 (ASP) 0.530 Plastic 1.660 20.4 −1.50 11 5.804 (ASP) 0.040 12 Lens6 −13.691 (ASP) 0.888 Plastic 1.544 55.9 5.31 13 −2.440 (ASP) 0.700 14IR-cut filter Plano 0.300 Glass 1.517 64.2 — 15 Plano 0.519 16 ImagePlano — Note: Reference wavelength is 587.6 nm (d-line).

TABLE 24 Aspheric Coefficients Surface # 1 2 3 4 5 6 k = −2.8815E+00−4.9166E−01 −1.9099E−01 3.8483E+00 −1.0693E+01 −2.5057E+01 A4 =2.6529E−03 5.5068E−03 −5.6141E−03 1.1543E−02 7.1542E−02 −1.5916E−01 A6 =−6.0554E−04 1.6154E−02 −1.2486E−02 −1.0230E−02 −2.1364E−02 1.6068E−01 A8= 4.2779E−05 −6.4444E−03 2.2924E−02 5.3462E−02 −2.7669E−01 −1.9548E−01A10 = −1.1875E−06 1.1284E−03 −8.0611E−03 −3.5601E−02 5.3450E−011.0185E−01 A12 = — — 8.9159E−04 9.2632E−03 −3.8331E−01 −6.5929E−02Surface # 8 9 10 11 12 13 k = −8.4770E+01 −1.8245E+00 −5.7655E−01−2.9735E+01 8.8307E+01 −1.2425E−01 A4 = −1.4750E−02 8.4058E−015.5976E−01 9.2464E−02 5.0794E−01 1.4149E−01 A6 = 2.7705E−01 −1.7578E+00−1.3078E+00 −1.0670E−01 −6.8669E−01 −2.2107E−02 A8 = −1.0346E+001.6598E+00 1.5269E+00 6.4486E−02 5.6913E−01 −3.2910E−02 A10 = 1.3639E+00−6.8327E−01 −7.7172E−01 4.5870E−03 −2.9063E−01 3.0493E−02 A12 =−6.8491E−01 5.3425E−02 1.2058E−01 −8.8703E−03 8.5420E−02 −1.2138E−02 A14= — — — — −1.0882E−02 1.9390E−03

In the 12th embodiment, the equation of the aspheric surface profiles ofthe aforementioned lens elements is the same as the equation of the 1stembodiment. Also, the definitions of these parameters shown in thefollowing table are the same as those stated in the 1st embodiment withcorresponding values for the 12th embodiment, so an explanation in thisregard will not be provided again.

Moreover, these parameters can be calculated from Table 23 and Table 24as the following values and satisfy the following conditions:

12th Embodiment f [mm] 1.25 (CT2/R3) + (CT2/R4) −0.96 Fno 2.10 (R9 +R10)/(R9 − R10) −0.65 HFOV [deg.] 95.0 (R11 + R12)/(R11 − R12) 1.43|1/tan(HFOV)| 0.09 f/T12 0.59 T56/T45 0.53 f3/f2 −0.09 CT2/CT3 2.31SL/TL 0.46 CT6/CT5 1.68 |Y62/Y11| 0.42

13th Embodiment

FIG. 25 is a schematic view of an image capturing unit according to the13th embodiment of the present disclosure. FIG. 26 shows, in order fromleft to right, spherical aberration curves, astigmatic field curves anda distortion curve of the image capturing unit according to the 13thembodiment. In FIG. 25, the image capturing unit includes the imagingoptical lens system (its reference numeral is omitted) of the presentdisclosure and an image sensor 1390. The imaging optical lens systemincludes, in order from an object side to an image side, a first lenselement 1310, a second lens element 1320, a third lens element 1330, anaperture stop 1300, a fourth lens element 1340, a fifth lens element1350, a sixth lens element 1360, an IR-cut filter 1370 and an imagesurface 1380, wherein the imaging optical lens system has a total of sixlens elements (1310-1360).

The first lens element 1310 with negative refractive power has anobject-side surface 1311 being convex in a paraxial region thereof andan image-side surface 1312 being concave in a paraxial region thereof.The first lens element 1310 is made of plastic material and has theobject-side surface 1311 and the image-side surface 1312 being bothaspheric.

The second lens element 1320 with positive refractive power has anobject-side surface 1321 being concave in a paraxial region thereof andan image-side surface 1322 being convex in a paraxial region thereof.The second lens element 1320 is made of plastic material and has theobject-side surface 1321 and the image-side surface 1322 being bothaspheric.

The third lens element 1330 with positive refractive power has anobject-side surface 1331 being concave in a paraxial region thereof andan image-side surface 1332 being convex in a paraxial region thereof.The third lens element 1330 is made of plastic material and has theobject-side surface 1331 and the image-side surface 1332 being bothaspheric.

The fourth lens element 1340 with positive refractive power has anobject-side surface 1341 being convex in a paraxial region thereof andan image-side surface 1342 being convex in a paraxial region thereof.The fourth lens element 1340 is made of plastic material and has theobject-side surface 1341 and the image-side surface 1342 being bothaspheric.

The fifth lens element 1350 with negative refractive power has anobject-side surface 1351 being concave in a paraxial region thereof andan image-side surface 1352 being concave in a paraxial region thereof.The fifth lens element 1350 is made of plastic material and has theobject-side surface 1351 and the image-side surface 1352 being bothaspheric.

The sixth lens element 1360 with positive refractive power has anobject-side surface 1361 being convex in a paraxial region thereof andan image-side surface 1362 being convex in a paraxial region thereof.The sixth lens element 1360 is made of plastic material and has theobject-side surface 1361 and the image-side surface 1362 being bothaspheric.

The IR-cut filter 1370 is made of glass material and located between thesixth lens element 1360 and the image surface 1380, and will not affectthe focal length of the imaging optical lens system. The image sensor1390 is disposed on or near the image surface 1380 of the imagingoptical lens system.

The detailed optical data of the 13th embodiment are shown in Table 25and the aspheric surface data are shown in Table 26 below.

TABLE 25 13th Embodiment f = 1.26 mm, Fno = 2.20, HFOV = 100.0 deg.Focal Surface # Curvature Radius Thickness Material Index Abbe # Length0 Object Plano Infinity 1 Lens 1 6.397 (ASP) 0.750 Plastic 1.544 56.0−3.57 2 1.429 (ASP) 2.333 3 Lens 2 −2.356 (ASP) 1.418 Plastic 1.639 23.59.78 4 −2.112 (ASP) 0.277 5 Lens 3 −5.999 (ASP) 1.155 Plastic 1.544 56.03.49 6 −1.541 (ASP) −0.161 7 Ape. Stop Plano 0.404 8 Lens 4 9.840 (ASP)1.000 Plastic 1.535 55.8 2.04 9 −1.182 (ASP) 0.142 10 Lens 5 −1.572(ASP) 0.394 Plastic 1.660 20.4 −1.47 11 2.784 (ASP) 0.097 12 Lens 63.429 (ASP) 0.794 Plastic 1.535 55.8 5.46 13 −18.009 (ASP) 0.500 14IR-cut filter Plano 0.300 Glass 1.517 64.2 — 15 Plano 0.464 16 ImagePlano — Note: Reference wavelength is 587.6 nm (d-line).

TABLE 26 Aspheric Coefficients Surface # 1 2 3 4 5 6 k = −1.5067E+00−9.9897E−01 −1.0090E+00 −1.1852E+01 −4.5073E+01 −9.1882E+00 A4 =1.8523E−03 2.7968E−02 9.4033E−03 2.0131E−02 1.1488E−01 −1.4912E−01 A6 =−6.0980E−04 4.3326E−03 1.6610E−02 3.9954E−02 −1.7695E−01 1.5852E−01 A8 =4.5588E−05 −8.4285E−04 −1.2685E−02 −3.2638E−02 7.8085E−02 −3.0815E−01A10 = −1.4536E−06 3.8559E−04 3.8411E−03 −5.3449E−03 −5.4660E−023.2488E−01 A12 = 1.7727E−08 −6.5786E−05 −3.6039E−04 1.2335E−021.0610E−02 −1.3145E−01 A14 = — — −1.8237E−05 −3.6680E−03 — — Surface # 89 10 11 12 13 k = 6.3776E+01 −1.4405E+00 −2.8689E−01 −3.3563E+01−8.5535E+01 −1.2828E+01 A4 = 1.8047E−01 2.7146E−01 2.3973E−01 1.3813E−011.4187E−01 −2.2624E−02 A6 = −3.3585E−01 −7.9709E−01 −1.0513E+00−4.0044E−01 −2.3100E−01 3.2624E−02 A8 = 3.9173E−01 1.2827E+00 2.1046E+006.7138E−01 1.7636E−01 −2.5116E−02 A10 = −2.6983E−01 −1.0800E+00−2.0275E+00 −5.5588E−01 4.0887E−05 −8.4841E−03 A12 = 7.2250E−023.8637E−01 8.2107E−01 2.2408E−01 −7.4672E−02 1.9054E−02 A14 = —−3.4058E−02 −8.6728E−02 −3.5365E−02 3.9478E−02 −8.1071E−03 — — — —−6.7203E−03 1.0435E−03

In the 13th embodiment, the equation of the aspheric surface profiles ofthe aforementioned lens elements is the same as the equation of the 1stembodiment. Also, the definitions of these parameters shown in thefollowing table are the same as those stated in the 1st embodiment withcorresponding values for the 13th embodiment, so an explanation in thisregard will not be provided again.

Moreover, these parameters can be calculated from Table 25 and Table 26as the following values and satisfy the following conditions:

13th Embodiment f [mm] 1.26 (CT2/R3) + (CT2/R4) −1.27 Fno 2.20 (R9 +R10)/(R9 − R10) −0.28 HFOV [deg.] 100.0 (R11 + R12)/(R11 − R12) −0.68|1/tan(HFOV)| 0.18 f/T12 0.54 T56/T45 0.68 f3/f2 0.36 CT2/CT3 1.23 SL/TL0.42 CT6/CT5 2.02 |Y62/Y11| 0.34

The foregoing description, for the purpose of explanation, has beendescribed with reference to specific embodiments. It is to be noted thatTABLES 1-26 show different data of the different embodiments; however,the data of the different embodiments are obtained from experiments. Theembodiments were chosen and described in order to best explain theprinciples of the disclosure and its practical applications, to therebyenable others skilled in the art to best utilize the disclosure andvarious embodiments with various modifications as are suited to theparticular use contemplated. The embodiments depicted above and theappended drawings are exemplary and are not intended to be exhaustive orto limit the scope of the present disclosure to the precise formsdisclosed. Many modifications and variations are possible in view of theabove teachings.

What is claimed is:
 1. An imaging optical lens system comprising, inorder from an object side to an image side: a first lens element havingnegative refractive power; a second lens element having an object-sidesurface being concave in a paraxial region thereof and an image-sidesurface being convex in a paraxial region thereof; a third lens elementhaving positive refractive power; a fourth lens element with positiverefractive power having an object-side surface being concave in aparaxial region thereof and an image-side surface being convex in aparaxial region thereof; a fifth lens element having negative refractivepower; and a sixth lens element having positive refractive power;wherein the imaging optical lens system has a total of six lenselements, and the imaging optical lens system further comprises anaperture stop disposed between the second lens element and an imagesurface; wherein an axial distance between the aperture stop and theimage surface is SL, an axial distance between an object-side surface ofthe first lens element and the image surface is TL, and the followingcondition is satisfied:0.20<SL/TL<0.70.
 2. The imaging optical lens system of claim 1, whereinthe third lens element has an object-side surface being convex in aparaxial region thereof.
 3. The imaging optical lens system of claim 1,wherein the sixth lens element has an object-side surface being concavein a paraxial region thereof and an image-side surface being convex in aparaxial region thereof.
 4. The imaging optical lens system of claim 1,wherein there is an air gap in a paraxial region located between everytwo lens elements of the imaging optical lens system that are adjacentto each other, the sixth lens element has an image-side surface beingconvex in a paraxial region thereof, and the image-side surface of thesixth lens element has at least one concave shape in an off-axis regionthereof.
 5. The imaging optical lens system of claim 1, wherein acurvature radius of an object-side surface of the fifth lens element isR9, a curvature radius of an image-side surface of the fifth lenselement is R10, and the following condition is satisfied:−8.0<(R9+R10)/(R9−R10)<0.
 6. The imaging optical lens system of claim 1,wherein a curvature radius of an object-side surface of the sixth lenselement is R11, a curvature radius of an image-side surface of the sixthlens element is R12, and the following condition is satisfied:0<(R11+R12)/(R11−R12)<5.5.
 7. The imaging optical lens system of claim1, wherein a focal length of the second lens element is f2, a focallength of the third lens element is f3, and the following condition issatisfied:−1.0<f3/f2<1.0.
 8. The imaging optical lens system of claim 1, wherein amaximum effective radius of the object-side surface of the first lenselement is Y11, a maximum effective radius of an image-side surface ofthe sixth lens element is Y62, and the following condition is satisfied:|Y62/Y11|<1.5.
 9. The imaging optical lens system of claim 1, wherein acentral thickness of the second lens element is CT2, a curvature radiusof the object-side surface of the second lens element is R3, a curvatureradius of the image-side surface of the second lens element is R4, andthe following condition is satisfied:−2.5<(CT2/R3)+(CT2/R4)<−0.75.
 10. The imaging optical lens system ofclaim 1, wherein half of a maximal field of view of the imaging opticallens system is HFOV, and the following condition is satisfied:|1/tan(HFOV)|<0.50.
 11. The imaging optical lens system of claim 1,wherein a maximum effective radius of the object-side surface of thefirst lens element is Y11, a maximum effective radius of an image-sidesurface of the sixth lens element is Y62, and the following condition issatisfied:|Y62/Y11|<0.55.
 12. The imaging optical lens system of claim 1, whereina central thickness of the second lens element is CT2, a centralthickness of the third lens element is CT3, and the following conditionis satisfied:0.80<CT2/CT3<7.50.
 13. The imaging optical lens system of claim 1,wherein a focal length of the imaging optical lens system is f, an axialdistance between the first lens element and the second lens element isT12, and the following condition is satisfied:0<f/T12<1.50.
 14. The imaging optical lens system of claim 1, wherein acentral thickness of the fifth lens element is CT5, a central thicknessof the sixth lens element is CT6, the axial distance between theaperture stop and the image surface is SL, the axial distance betweenthe object-side surface of the first lens element and the image surfaceis TL, and the following conditions are satisfied:0.20<CT6/CT5<7.0; and0.42≤SL/TL<0.70.
 15. The imaging optical lens system of claim 1, whereinan axial distance between the fourth lens element and the fifth lenselement is T45, an axial distance between the fifth lens element and thesixth lens element is T56, and the following condition is satisfied:0<T56/T45<5.5.
 16. The imaging optical lens system of claim 1, whereinthe fifth lens element has an object-side surface being concave in aparaxial region thereof, and the aperture stop is disposed between thesecond lens element and the fourth lens element.
 17. An image capturingunit, comprising: the imaging optical lens system of claim 1; and animage sensor, wherein the image sensor is disposed on the image surfaceof the imaging optical lens system.
 18. An electronic device,comprising: the image capturing unit of claim 17.